/****************************************************** Interface between Innobase row operations and MySQL. Contains also create table and other data dictionary operations. (c) 2000 Innobase Oy Created 9/17/2000 Heikki Tuuri *******************************************************/ #include "row0mysql.h" #ifdef UNIV_NONINL #include "row0mysql.ic" #endif #include "row0ins.h" #include "row0sel.h" #include "row0upd.h" #include "row0row.h" #include "que0que.h" #include "pars0pars.h" #include "dict0dict.h" #include "dict0crea.h" #include "dict0load.h" #include "dict0boot.h" #include "trx0roll.h" #include "trx0purge.h" #include "lock0lock.h" #include "rem0cmp.h" #include "log0log.h" #include "btr0sea.h" #include "fil0fil.h" #include "ibuf0ibuf.h" /* A dummy variable used to fool the compiler */ ibool row_mysql_identically_false = FALSE; /* Provide optional 4.x backwards compatibility for 5.0 and above */ ibool row_rollback_on_timeout = FALSE; /* List of tables we should drop in background. ALTER TABLE in MySQL requires that the table handler can drop the table in background when there are no queries to it any more. Protected by the kernel mutex. */ typedef struct row_mysql_drop_struct row_mysql_drop_t; struct row_mysql_drop_struct{ char* table_name; UT_LIST_NODE_T(row_mysql_drop_t) row_mysql_drop_list; }; UT_LIST_BASE_NODE_T(row_mysql_drop_t) row_mysql_drop_list; ibool row_mysql_drop_list_inited = FALSE; /* Magic table names for invoking various monitor threads */ static const char S_innodb_monitor[] = "innodb_monitor"; static const char S_innodb_lock_monitor[] = "innodb_lock_monitor"; static const char S_innodb_tablespace_monitor[] = "innodb_tablespace_monitor"; static const char S_innodb_table_monitor[] = "innodb_table_monitor"; static const char S_innodb_mem_validate[] = "innodb_mem_validate"; /*********************************************************************** Determine if the given name is a name reserved for MySQL system tables. */ static ibool row_mysql_is_system_table( /*======================*/ /* out: TRUE if name is a MySQL system table name */ const char* name) { if (strncmp(name, "mysql/", 6) != 0) { return(FALSE); } return(0 == strcmp(name + 6, "host") || 0 == strcmp(name + 6, "user") || 0 == strcmp(name + 6, "db")); } /*********************************************************************** Delays an INSERT, DELETE or UPDATE operation if the purge is lagging. */ static void row_mysql_delay_if_needed(void) /*===========================*/ { if (srv_dml_needed_delay) { os_thread_sleep(srv_dml_needed_delay); } } /*********************************************************************** Frees the blob heap in prebuilt when no longer needed. */ void row_mysql_prebuilt_free_blob_heap( /*==============================*/ row_prebuilt_t* prebuilt) /* in: prebuilt struct of a ha_innobase:: table handle */ { mem_heap_free(prebuilt->blob_heap); prebuilt->blob_heap = NULL; } /*********************************************************************** Stores a >= 5.0.3 format true VARCHAR length to dest, in the MySQL row format. */ byte* row_mysql_store_true_var_len( /*=========================*/ /* out: pointer to the data, we skip the 1 or 2 bytes at the start that are used to store the len */ byte* dest, /* in: where to store */ ulint len, /* in: length, must fit in two bytes */ ulint lenlen) /* in: storage length of len: either 1 or 2 bytes */ { if (lenlen == 2) { ut_a(len < 256 * 256); mach_write_to_2_little_endian(dest, len); return(dest + 2); } ut_a(lenlen == 1); ut_a(len < 256); mach_write_to_1(dest, len); return(dest + 1); } /*********************************************************************** Reads a >= 5.0.3 format true VARCHAR length, in the MySQL row format, and returns a pointer to the data. */ byte* row_mysql_read_true_varchar( /*========================*/ /* out: pointer to the data, we skip the 1 or 2 bytes at the start that are used to store the len */ ulint* len, /* out: variable-length field length */ byte* field, /* in: field in the MySQL format */ ulint lenlen) /* in: storage length of len: either 1 or 2 bytes */ { if (lenlen == 2) { *len = mach_read_from_2_little_endian(field); return(field + 2); } ut_a(lenlen == 1); *len = mach_read_from_1(field); return(field + 1); } /*********************************************************************** Stores a reference to a BLOB in the MySQL format. */ void row_mysql_store_blob_ref( /*=====================*/ byte* dest, /* in: where to store */ ulint col_len, /* in: dest buffer size: determines into how many bytes the BLOB length is stored, the space for the length may vary from 1 to 4 bytes */ byte* data, /* in: BLOB data; if the value to store is SQL NULL this should be NULL pointer */ ulint len) /* in: BLOB length; if the value to store is SQL NULL this should be 0; remember also to set the NULL bit in the MySQL record header! */ { /* MySQL might assume the field is set to zero except the length and the pointer fields */ memset(dest, '\0', col_len); /* In dest there are 1 - 4 bytes reserved for the BLOB length, and after that 8 bytes reserved for the pointer to the data. In 32-bit architectures we only use the first 4 bytes of the pointer slot. */ ut_a(col_len - 8 > 1 || len < 256); ut_a(col_len - 8 > 2 || len < 256 * 256); ut_a(col_len - 8 > 3 || len < 256 * 256 * 256); mach_write_to_n_little_endian(dest, col_len - 8, len); ut_memcpy(dest + col_len - 8, &data, sizeof(byte*)); } /*********************************************************************** Reads a reference to a BLOB in the MySQL format. */ byte* row_mysql_read_blob_ref( /*====================*/ /* out: pointer to BLOB data */ ulint* len, /* out: BLOB length */ byte* ref, /* in: BLOB reference in the MySQL format */ ulint col_len) /* in: BLOB reference length (not BLOB length) */ { byte* data; *len = mach_read_from_n_little_endian(ref, col_len - 8); ut_memcpy(&data, ref + col_len - 8, sizeof(byte*)); return(data); } /****************************************************************** Stores a non-SQL-NULL field given in the MySQL format in the InnoDB format. The counterpart of this function is row_sel_field_store_in_mysql_format() in row0sel.c. */ byte* row_mysql_store_col_in_innobase_format( /*===================================*/ /* out: up to which byte we used buf in the conversion */ dfield_t* dfield, /* in/out: dfield where dtype information must be already set when this function is called! */ byte* buf, /* in/out: buffer for a converted integer value; this must be at least col_len long then! */ ibool row_format_col, /* TRUE if the mysql_data is from a MySQL row, FALSE if from a MySQL key value; in MySQL, a true VARCHAR storage format differs in a row and in a key value: in a key value the length is always stored in 2 bytes! */ byte* mysql_data, /* in: MySQL column value, not SQL NULL; NOTE that dfield may also get a pointer to mysql_data, therefore do not discard this as long as dfield is used! */ ulint col_len, /* in: MySQL column length; NOTE that this is the storage length of the column in the MySQL format row, not necessarily the length of the actual payload data; if the column is a true VARCHAR then this is irrelevant */ ulint comp) /* in: nonzero=compact format */ { byte* ptr = mysql_data; dtype_t* dtype; ulint type; ulint lenlen; dtype = dfield_get_type(dfield); type = dtype->mtype; if (type == DATA_INT) { /* Store integer data in Innobase in a big-endian format, sign bit negated if the data is a signed integer. In MySQL, integers are stored in a little-endian format. */ ptr = buf + col_len; for (;;) { ptr--; *ptr = *mysql_data; if (ptr == buf) { break; } mysql_data++; } if (!(dtype->prtype & DATA_UNSIGNED)) { *ptr = (byte) (*ptr ^ 128); } buf += col_len; } else if ((type == DATA_VARCHAR || type == DATA_VARMYSQL || type == DATA_BINARY)) { if (dtype_get_mysql_type(dtype) == DATA_MYSQL_TRUE_VARCHAR) { /* The length of the actual data is stored to 1 or 2 bytes at the start of the field */ if (row_format_col) { if (dtype->prtype & DATA_LONG_TRUE_VARCHAR) { lenlen = 2; } else { lenlen = 1; } } else { /* In a MySQL key value, lenlen is always 2 */ lenlen = 2; } ptr = row_mysql_read_true_varchar(&col_len, mysql_data, lenlen); } else { /* Remove trailing spaces from old style VARCHAR columns. */ /* Handle UCS2 strings differently. */ ulint mbminlen = dtype_get_mbminlen(dtype); ptr = mysql_data; if (mbminlen == 2) { /* space=0x0020 */ /* Trim "half-chars", just in case. */ col_len &= ~1; while (col_len >= 2 && ptr[col_len - 2] == 0x00 && ptr[col_len - 1] == 0x20) { col_len -= 2; } } else { ut_a(mbminlen == 1); /* space=0x20 */ while (col_len > 0 && ptr[col_len - 1] == 0x20) { col_len--; } } } } else if (comp && type == DATA_MYSQL && dtype_get_mbminlen(dtype) == 1 && dtype_get_mbmaxlen(dtype) > 1) { /* In some cases we strip trailing spaces from UTF-8 and other multibyte charsets, from FIXED-length CHAR columns, to save space. UTF-8 would otherwise normally use 3 * the string length bytes to store a latin1 string! */ /* We assume that this CHAR field is encoded in a variable-length character set where spaces have 1:1 correspondence to 0x20 bytes, such as UTF-8. Consider a CHAR(n) field, a field of n characters. It will contain between n * mbminlen and n * mbmaxlen bytes. We will try to truncate it to n bytes by stripping space padding. If the field contains single-byte characters only, it will be truncated to n characters. Consider a CHAR(5) field containing the string ".a " where "." denotes a 3-byte character represented by the bytes "$%&". After our stripping, the string will be stored as "$%&a " (5 bytes). The string ".abc " will be stored as "$%&abc" (6 bytes). The space padding will be restored in row0sel.c, function row_sel_field_store_in_mysql_format(). */ ulint n_chars; ut_a(!(dtype_get_len(dtype) % dtype_get_mbmaxlen(dtype))); n_chars = dtype_get_len(dtype) / dtype_get_mbmaxlen(dtype); /* Strip space padding. */ while (col_len > n_chars && ptr[col_len - 1] == 0x20) { col_len--; } } else if (type == DATA_BLOB && row_format_col) { ptr = row_mysql_read_blob_ref(&col_len, mysql_data, col_len); } dfield_set_data(dfield, ptr, col_len); return(buf); } /****************************************************************** Convert a row in the MySQL format to a row in the Innobase format. Note that the function to convert a MySQL format key value to an InnoDB dtuple is row_sel_convert_mysql_key_to_innobase() in row0sel.c. */ static void row_mysql_convert_row_to_innobase( /*==============================*/ dtuple_t* row, /* in/out: Innobase row where the field type information is already copied there! */ row_prebuilt_t* prebuilt, /* in: prebuilt struct where template must be of type ROW_MYSQL_WHOLE_ROW */ byte* mysql_rec) /* in: row in the MySQL format; NOTE: do not discard as long as row is used, as row may contain pointers to this record! */ { mysql_row_templ_t* templ; dfield_t* dfield; ulint i; ut_ad(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW); ut_ad(prebuilt->mysql_template); for (i = 0; i < prebuilt->n_template; i++) { templ = prebuilt->mysql_template + i; dfield = dtuple_get_nth_field(row, i); if (templ->mysql_null_bit_mask != 0) { /* Column may be SQL NULL */ if (mysql_rec[templ->mysql_null_byte_offset] & (byte) (templ->mysql_null_bit_mask)) { /* It is SQL NULL */ dfield_set_data(dfield, NULL, UNIV_SQL_NULL); goto next_column; } } row_mysql_store_col_in_innobase_format( dfield, prebuilt->ins_upd_rec_buff + templ->mysql_col_offset, TRUE, /* MySQL row format data */ mysql_rec + templ->mysql_col_offset, templ->mysql_col_len, dict_table_is_comp(prebuilt->table)); next_column: ; } } /******************************************************************** Handles user errors and lock waits detected by the database engine. */ ibool row_mysql_handle_errors( /*====================*/ /* out: TRUE if it was a lock wait and we should continue running the query thread */ ulint* new_err,/* out: possible new error encountered in lock wait, or if no new error, the value of trx->error_state at the entry of this function */ trx_t* trx, /* in: transaction */ que_thr_t* thr, /* in: query thread */ trx_savept_t* savept) /* in: savepoint or NULL */ { #ifndef UNIV_HOTBACKUP ulint err; handle_new_error: err = trx->error_state; ut_a(err != DB_SUCCESS); trx->error_state = DB_SUCCESS; if ((err == DB_DUPLICATE_KEY) || (err == DB_FOREIGN_DUPLICATE_KEY)) { if (savept) { /* Roll back the latest, possibly incomplete insertion or update */ trx_general_rollback_for_mysql(trx, TRUE, savept); } } else if (err == DB_TOO_BIG_RECORD) { if (savept) { /* Roll back the latest, possibly incomplete insertion or update */ trx_general_rollback_for_mysql(trx, TRUE, savept); } /* MySQL will roll back the latest SQL statement */ } else if (err == DB_ROW_IS_REFERENCED || err == DB_NO_REFERENCED_ROW || err == DB_CANNOT_ADD_CONSTRAINT || err == DB_TOO_MANY_CONCURRENT_TRXS) { if (savept) { /* Roll back the latest, possibly incomplete insertion or update */ trx_general_rollback_for_mysql(trx, TRUE, savept); } /* MySQL will roll back the latest SQL statement */ } else if (err == DB_LOCK_WAIT) { srv_suspend_mysql_thread(thr); if (trx->error_state != DB_SUCCESS) { que_thr_stop_for_mysql(thr); goto handle_new_error; } *new_err = err; return(TRUE); } else if (err == DB_DEADLOCK || err == DB_LOCK_TABLE_FULL || (err == DB_LOCK_WAIT_TIMEOUT && row_rollback_on_timeout)) { /* Roll back the whole transaction; this resolution was added to version 3.23.43 */ trx_general_rollback_for_mysql(trx, FALSE, NULL); } else if (err == DB_OUT_OF_FILE_SPACE || err == DB_LOCK_WAIT_TIMEOUT) { ut_ad(!(err == DB_LOCK_WAIT_TIMEOUT && row_rollback_on_timeout)); if (savept) { /* Roll back the latest, possibly incomplete insertion or update */ trx_general_rollback_for_mysql(trx, TRUE, savept); } /* MySQL will roll back the latest SQL statement */ } else if (err == DB_MUST_GET_MORE_FILE_SPACE) { fputs("InnoDB: The database cannot continue" " operation because of\n" "InnoDB: lack of space. You must add" " a new data file to\n" "InnoDB: my.cnf and restart the database.\n", stderr); exit(1); } else if (err == DB_CORRUPTION) { fputs("InnoDB: We detected index corruption" " in an InnoDB type table.\n" "InnoDB: You have to dump + drop + reimport" " the table or, in\n" "InnoDB: a case of widespread corruption," " dump all InnoDB\n" "InnoDB: tables and recreate the" " whole InnoDB tablespace.\n" "InnoDB: If the mysqld server crashes" " after the startup or when\n" "InnoDB: you dump the tables, look at\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "forcing-recovery.html" " for help.\n", stderr); } else { fprintf(stderr, "InnoDB: unknown error code %lu\n", (ulong) err); ut_error; } if (trx->error_state != DB_SUCCESS) { *new_err = trx->error_state; } else { *new_err = err; } trx->error_state = DB_SUCCESS; return(FALSE); #else /* UNIV_HOTBACKUP */ /* This function depends on MySQL code that is not included in InnoDB Hot Backup builds. Besides, this function should never be called in InnoDB Hot Backup. */ ut_error; return(FALSE); #endif /* UNIV_HOTBACKUP */ } /************************************************************************ Create a prebuilt struct for a MySQL table handle. */ row_prebuilt_t* row_create_prebuilt( /*================*/ /* out, own: a prebuilt struct */ dict_table_t* table) /* in: Innobase table handle */ { row_prebuilt_t* prebuilt; mem_heap_t* heap; dict_index_t* clust_index; dtuple_t* ref; ulint ref_len; ulint i; heap = mem_heap_create(128); prebuilt = mem_heap_alloc(heap, sizeof(row_prebuilt_t)); prebuilt->magic_n = ROW_PREBUILT_ALLOCATED; prebuilt->magic_n2 = ROW_PREBUILT_ALLOCATED; prebuilt->table = table; prebuilt->trx = NULL; prebuilt->sql_stat_start = TRUE; prebuilt->mysql_has_locked = FALSE; prebuilt->index = NULL; prebuilt->used_in_HANDLER = FALSE; prebuilt->n_template = 0; prebuilt->mysql_template = NULL; prebuilt->heap = heap; prebuilt->ins_node = NULL; prebuilt->ins_upd_rec_buff = NULL; prebuilt->upd_node = NULL; prebuilt->ins_graph = NULL; prebuilt->upd_graph = NULL; prebuilt->pcur = btr_pcur_create_for_mysql(); prebuilt->clust_pcur = btr_pcur_create_for_mysql(); prebuilt->select_lock_type = LOCK_NONE; prebuilt->stored_select_lock_type = 99999999; prebuilt->row_read_type = ROW_READ_WITH_LOCKS; prebuilt->sel_graph = NULL; prebuilt->search_tuple = dtuple_create( heap, 2 * dict_table_get_n_cols(table)); clust_index = dict_table_get_first_index(table); /* Make sure that search_tuple is long enough for clustered index */ ut_a(2 * dict_table_get_n_cols(table) >= clust_index->n_fields); ref_len = dict_index_get_n_unique(clust_index); ref = dtuple_create(heap, ref_len); dict_index_copy_types(ref, clust_index, ref_len); prebuilt->clust_ref = ref; for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) { prebuilt->fetch_cache[i] = NULL; } prebuilt->n_fetch_cached = 0; prebuilt->blob_heap = NULL; prebuilt->old_vers_heap = NULL; prebuilt->last_value = 0; return(prebuilt); } /************************************************************************ Free a prebuilt struct for a MySQL table handle. */ void row_prebuilt_free( /*==============*/ row_prebuilt_t* prebuilt) /* in, own: prebuilt struct */ { ulint i; if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED || prebuilt->magic_n2 != ROW_PREBUILT_ALLOCATED) { fprintf(stderr, "InnoDB: Error: trying to free a corrupt\n" "InnoDB: table handle. Magic n %lu," " magic n2 %lu, table name", (ulong) prebuilt->magic_n, (ulong) prebuilt->magic_n2); ut_print_name(stderr, NULL, TRUE, prebuilt->table->name); putc('\n', stderr); mem_analyze_corruption(prebuilt); ut_error; } prebuilt->magic_n = ROW_PREBUILT_FREED; prebuilt->magic_n2 = ROW_PREBUILT_FREED; btr_pcur_free_for_mysql(prebuilt->pcur); btr_pcur_free_for_mysql(prebuilt->clust_pcur); if (prebuilt->mysql_template) { mem_free(prebuilt->mysql_template); } if (prebuilt->ins_graph) { que_graph_free_recursive(prebuilt->ins_graph); } if (prebuilt->sel_graph) { que_graph_free_recursive(prebuilt->sel_graph); } if (prebuilt->upd_graph) { que_graph_free_recursive(prebuilt->upd_graph); } if (prebuilt->blob_heap) { mem_heap_free(prebuilt->blob_heap); } if (prebuilt->old_vers_heap) { mem_heap_free(prebuilt->old_vers_heap); } for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) { if (prebuilt->fetch_cache[i] != NULL) { if ((ROW_PREBUILT_FETCH_MAGIC_N != mach_read_from_4( (prebuilt->fetch_cache[i]) - 4)) || (ROW_PREBUILT_FETCH_MAGIC_N != mach_read_from_4( (prebuilt->fetch_cache[i]) + prebuilt->mysql_row_len))) { fputs("InnoDB: Error: trying to free" " a corrupt fetch buffer.\n", stderr); mem_analyze_corruption( prebuilt->fetch_cache[i]); ut_error; } mem_free((prebuilt->fetch_cache[i]) - 4); } } dict_table_decrement_handle_count(prebuilt->table); mem_heap_free(prebuilt->heap); } /************************************************************************* Updates the transaction pointers in query graphs stored in the prebuilt struct. */ void row_update_prebuilt_trx( /*====================*/ /* out: prebuilt dtuple */ row_prebuilt_t* prebuilt, /* in: prebuilt struct in MySQL handle */ trx_t* trx) /* in: transaction handle */ { if (trx->magic_n != TRX_MAGIC_N) { fprintf(stderr, "InnoDB: Error: trying to use a corrupt\n" "InnoDB: trx handle. Magic n %lu\n", (ulong) trx->magic_n); mem_analyze_corruption(trx); ut_error; } if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) { fprintf(stderr, "InnoDB: Error: trying to use a corrupt\n" "InnoDB: table handle. Magic n %lu, table name", (ulong) prebuilt->magic_n); ut_print_name(stderr, NULL, TRUE, prebuilt->table->name); putc('\n', stderr); mem_analyze_corruption(prebuilt); ut_error; } prebuilt->trx = trx; if (prebuilt->ins_graph) { prebuilt->ins_graph->trx = trx; } if (prebuilt->upd_graph) { prebuilt->upd_graph->trx = trx; } if (prebuilt->sel_graph) { prebuilt->sel_graph->trx = trx; } } /************************************************************************* Gets pointer to a prebuilt dtuple used in insertions. If the insert graph has not yet been built in the prebuilt struct, then this function first builds it. */ static dtuple_t* row_get_prebuilt_insert_row( /*========================*/ /* out: prebuilt dtuple; the column type information is also set in it */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { ins_node_t* node; dtuple_t* row; dict_table_t* table = prebuilt->table; ulint i; ut_ad(prebuilt && table && prebuilt->trx); if (prebuilt->ins_node == NULL) { /* Not called before for this handle: create an insert node and query graph to the prebuilt struct */ node = ins_node_create(INS_DIRECT, table, prebuilt->heap); prebuilt->ins_node = node; if (prebuilt->ins_upd_rec_buff == NULL) { prebuilt->ins_upd_rec_buff = mem_heap_alloc( prebuilt->heap, prebuilt->mysql_row_len); } row = dtuple_create(prebuilt->heap, dict_table_get_n_cols(table)); dict_table_copy_types(row, table); /* We init the value of every field to the SQL NULL to avoid a debug assertion from failing */ for (i = 0; i < dtuple_get_n_fields(row); i++) { dtuple_get_nth_field(row, i)->len = UNIV_SQL_NULL; } ins_node_set_new_row(node, row); prebuilt->ins_graph = que_node_get_parent( pars_complete_graph_for_exec(node, prebuilt->trx, prebuilt->heap)); prebuilt->ins_graph->state = QUE_FORK_ACTIVE; } return(prebuilt->ins_node->row); } /************************************************************************* Updates the table modification counter and calculates new estimates for table and index statistics if necessary. */ UNIV_INLINE void row_update_statistics_if_needed( /*============================*/ dict_table_t* table) /* in: table */ { ulint counter; counter = table->stat_modified_counter; table->stat_modified_counter = counter + 1; /* Calculate new statistics if 1 / 16 of table has been modified since the last time a statistics batch was run, or if stat_modified_counter > 2 000 000 000 (to avoid wrap-around). We calculate statistics at most every 16th round, since we may have a counter table which is very small and updated very often. */ if (counter > 2000000000 || ((ib_longlong)counter > 16 + table->stat_n_rows / 16)) { dict_update_statistics(table); } } /************************************************************************* Unlocks an AUTO_INC type lock possibly reserved by trx. */ void row_unlock_table_autoinc_for_mysql( /*===============================*/ trx_t* trx) /* in: transaction */ { if (!trx->auto_inc_lock) { return; } lock_table_unlock_auto_inc(trx); } /************************************************************************* Sets an AUTO_INC type lock on the table mentioned in prebuilt. The AUTO_INC lock gives exclusive access to the auto-inc counter of the table. The lock is reserved only for the duration of an SQL statement. It is not compatible with another AUTO_INC or exclusive lock on the table. */ int row_lock_table_autoinc_for_mysql( /*=============================*/ /* out: error code or DB_SUCCESS */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in the MySQL table handle */ { trx_t* trx = prebuilt->trx; ins_node_t* node = prebuilt->ins_node; que_thr_t* thr; ulint err; ibool was_lock_wait; ut_ad(trx); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); if (trx->auto_inc_lock) { return(DB_SUCCESS); } trx->op_info = "setting auto-inc lock"; if (node == NULL) { row_get_prebuilt_insert_row(prebuilt); node = prebuilt->ins_node; } /* We use the insert query graph as the dummy graph needed in the lock module call */ thr = que_fork_get_first_thr(prebuilt->ins_graph); que_thr_move_to_run_state_for_mysql(thr, trx); run_again: thr->run_node = node; thr->prev_node = node; /* It may be that the current session has not yet started its transaction, or it has been committed: */ trx_start_if_not_started(trx); err = lock_table(0, prebuilt->table, LOCK_AUTO_INC, thr); trx->error_state = err; if (err != DB_SUCCESS) { que_thr_stop_for_mysql(thr); was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL); if (was_lock_wait) { goto run_again; } trx->op_info = ""; return((int) err); } que_thr_stop_for_mysql_no_error(thr, trx); trx->op_info = ""; return((int) err); } /************************************************************************* Sets a table lock on the table mentioned in prebuilt. */ int row_lock_table_for_mysql( /*=====================*/ /* out: error code or DB_SUCCESS */ row_prebuilt_t* prebuilt, /* in: prebuilt struct in the MySQL table handle */ dict_table_t* table, /* in: table to lock, or NULL if prebuilt->table should be locked as prebuilt->select_lock_type */ ulint mode) /* in: lock mode of table (ignored if table==NULL) */ { trx_t* trx = prebuilt->trx; que_thr_t* thr; ulint err; ibool was_lock_wait; ut_ad(trx); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); trx->op_info = "setting table lock"; if (prebuilt->sel_graph == NULL) { /* Build a dummy select query graph */ row_prebuild_sel_graph(prebuilt); } /* We use the select query graph as the dummy graph needed in the lock module call */ thr = que_fork_get_first_thr(prebuilt->sel_graph); que_thr_move_to_run_state_for_mysql(thr, trx); run_again: thr->run_node = thr; thr->prev_node = thr->common.parent; /* It may be that the current session has not yet started its transaction, or it has been committed: */ trx_start_if_not_started(trx); if (table) { err = lock_table(0, table, mode, thr); } else { err = lock_table(0, prebuilt->table, prebuilt->select_lock_type, thr); } trx->error_state = err; if (err != DB_SUCCESS) { que_thr_stop_for_mysql(thr); was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL); if (was_lock_wait) { goto run_again; } trx->op_info = ""; return((int) err); } que_thr_stop_for_mysql_no_error(thr, trx); trx->op_info = ""; return((int) err); } /************************************************************************* Does an insert for MySQL. */ int row_insert_for_mysql( /*=================*/ /* out: error code or DB_SUCCESS */ byte* mysql_rec, /* in: row in the MySQL format */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { trx_savept_t savept; que_thr_t* thr; ulint err; ibool was_lock_wait; trx_t* trx = prebuilt->trx; ins_node_t* node = prebuilt->ins_node; ut_ad(trx); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); if (prebuilt->table->ibd_file_missing) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error:\n" "InnoDB: MySQL is trying to use a table handle" " but the .ibd file for\n" "InnoDB: table %s does not exist.\n" "InnoDB: Have you deleted the .ibd file" " from the database directory under\n" "InnoDB: the MySQL datadir, or have you" " used DISCARD TABLESPACE?\n" "InnoDB: Look from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n" "InnoDB: how you can resolve the problem.\n", prebuilt->table->name); return(DB_ERROR); } if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) { fprintf(stderr, "InnoDB: Error: trying to free a corrupt\n" "InnoDB: table handle. Magic n %lu, table name", (ulong) prebuilt->magic_n); ut_print_name(stderr, prebuilt->trx, TRUE, prebuilt->table->name); putc('\n', stderr); mem_analyze_corruption(prebuilt); ut_error; } if (srv_created_new_raw || srv_force_recovery) { fputs("InnoDB: A new raw disk partition was initialized or\n" "InnoDB: innodb_force_recovery is on: we do not allow\n" "InnoDB: database modifications by the user. Shut down\n" "InnoDB: mysqld and edit my.cnf so that" " newraw is replaced\n" "InnoDB: with raw, and innodb_force_... is removed.\n", stderr); return(DB_ERROR); } trx->op_info = "inserting"; row_mysql_delay_if_needed(); trx_start_if_not_started(trx); if (node == NULL) { row_get_prebuilt_insert_row(prebuilt); node = prebuilt->ins_node; } row_mysql_convert_row_to_innobase(node->row, prebuilt, mysql_rec); savept = trx_savept_take(trx); thr = que_fork_get_first_thr(prebuilt->ins_graph); if (prebuilt->sql_stat_start) { node->state = INS_NODE_SET_IX_LOCK; prebuilt->sql_stat_start = FALSE; } else { node->state = INS_NODE_ALLOC_ROW_ID; } que_thr_move_to_run_state_for_mysql(thr, trx); run_again: thr->run_node = node; thr->prev_node = node; row_ins_step(thr); err = trx->error_state; if (err != DB_SUCCESS) { que_thr_stop_for_mysql(thr); /* TODO: what is this? */ thr->lock_state= QUE_THR_LOCK_ROW; was_lock_wait = row_mysql_handle_errors(&err, trx, thr, &savept); thr->lock_state= QUE_THR_LOCK_NOLOCK; if (was_lock_wait) { goto run_again; } trx->op_info = ""; return((int) err); } que_thr_stop_for_mysql_no_error(thr, trx); prebuilt->table->stat_n_rows++; srv_n_rows_inserted++; if (prebuilt->table->stat_n_rows == 0) { /* Avoid wrap-over */ prebuilt->table->stat_n_rows--; } row_update_statistics_if_needed(prebuilt->table); trx->op_info = ""; return((int) err); } /************************************************************************* Builds a dummy query graph used in selects. */ void row_prebuild_sel_graph( /*===================*/ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { sel_node_t* node; ut_ad(prebuilt && prebuilt->trx); if (prebuilt->sel_graph == NULL) { node = sel_node_create(prebuilt->heap); prebuilt->sel_graph = que_node_get_parent( pars_complete_graph_for_exec(node, prebuilt->trx, prebuilt->heap)); prebuilt->sel_graph->state = QUE_FORK_ACTIVE; } } /************************************************************************* Creates an query graph node of 'update' type to be used in the MySQL interface. */ upd_node_t* row_create_update_node_for_mysql( /*=============================*/ /* out, own: update node */ dict_table_t* table, /* in: table to update */ mem_heap_t* heap) /* in: mem heap from which allocated */ { upd_node_t* node; node = upd_node_create(heap); node->in_mysql_interface = TRUE; node->is_delete = FALSE; node->searched_update = FALSE; node->select_will_do_update = FALSE; node->select = NULL; node->pcur = btr_pcur_create_for_mysql(); node->table = table; node->update = upd_create(dict_table_get_n_cols(table), heap); node->update_n_fields = dict_table_get_n_cols(table); UT_LIST_INIT(node->columns); node->has_clust_rec_x_lock = TRUE; node->cmpl_info = 0; node->table_sym = NULL; node->col_assign_list = NULL; return(node); } /************************************************************************* Gets pointer to a prebuilt update vector used in updates. If the update graph has not yet been built in the prebuilt struct, then this function first builds it. */ upd_t* row_get_prebuilt_update_vector( /*===========================*/ /* out: prebuilt update vector */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { dict_table_t* table = prebuilt->table; upd_node_t* node; ut_ad(prebuilt && table && prebuilt->trx); if (prebuilt->upd_node == NULL) { /* Not called before for this handle: create an update node and query graph to the prebuilt struct */ node = row_create_update_node_for_mysql(table, prebuilt->heap); prebuilt->upd_node = node; prebuilt->upd_graph = que_node_get_parent( pars_complete_graph_for_exec(node, prebuilt->trx, prebuilt->heap)); prebuilt->upd_graph->state = QUE_FORK_ACTIVE; } return(prebuilt->upd_node->update); } /************************************************************************* Does an update or delete of a row for MySQL. */ int row_update_for_mysql( /*=================*/ /* out: error code or DB_SUCCESS */ byte* mysql_rec, /* in: the row to be updated, in the MySQL format */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { trx_savept_t savept; ulint err; que_thr_t* thr; ibool was_lock_wait; dict_index_t* clust_index; /* ulint ref_len; */ upd_node_t* node; dict_table_t* table = prebuilt->table; trx_t* trx = prebuilt->trx; ut_ad(prebuilt && trx); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); UT_NOT_USED(mysql_rec); if (prebuilt->table->ibd_file_missing) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error:\n" "InnoDB: MySQL is trying to use a table handle" " but the .ibd file for\n" "InnoDB: table %s does not exist.\n" "InnoDB: Have you deleted the .ibd file" " from the database directory under\n" "InnoDB: the MySQL datadir, or have you" " used DISCARD TABLESPACE?\n" "InnoDB: Look from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n" "InnoDB: how you can resolve the problem.\n", prebuilt->table->name); return(DB_ERROR); } if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) { fprintf(stderr, "InnoDB: Error: trying to free a corrupt\n" "InnoDB: table handle. Magic n %lu, table name", (ulong) prebuilt->magic_n); ut_print_name(stderr, prebuilt->trx, TRUE, prebuilt->table->name); putc('\n', stderr); mem_analyze_corruption(prebuilt); ut_error; } if (srv_created_new_raw || srv_force_recovery) { fputs("InnoDB: A new raw disk partition was initialized or\n" "InnoDB: innodb_force_recovery is on: we do not allow\n" "InnoDB: database modifications by the user. Shut down\n" "InnoDB: mysqld and edit my.cnf so that newraw" " is replaced\n" "InnoDB: with raw, and innodb_force_... is removed.\n", stderr); return(DB_ERROR); } trx->op_info = "updating or deleting"; row_mysql_delay_if_needed(); trx_start_if_not_started(trx); node = prebuilt->upd_node; clust_index = dict_table_get_first_index(table); if (prebuilt->pcur->btr_cur.index == clust_index) { btr_pcur_copy_stored_position(node->pcur, prebuilt->pcur); } else { btr_pcur_copy_stored_position(node->pcur, prebuilt->clust_pcur); } ut_a(node->pcur->rel_pos == BTR_PCUR_ON); /* MySQL seems to call rnd_pos before updating each row it has cached: we can get the correct cursor position from prebuilt->pcur; NOTE that we cannot build the row reference from mysql_rec if the clustered index was automatically generated for the table: MySQL does not know anything about the row id used as the clustered index key */ savept = trx_savept_take(trx); thr = que_fork_get_first_thr(prebuilt->upd_graph); node->state = UPD_NODE_UPDATE_CLUSTERED; ut_ad(!prebuilt->sql_stat_start); que_thr_move_to_run_state_for_mysql(thr, trx); run_again: thr->run_node = node; thr->prev_node = node; row_upd_step(thr); err = trx->error_state; if (err != DB_SUCCESS) { que_thr_stop_for_mysql(thr); if (err == DB_RECORD_NOT_FOUND) { trx->error_state = DB_SUCCESS; trx->op_info = ""; return((int) err); } thr->lock_state= QUE_THR_LOCK_ROW; was_lock_wait = row_mysql_handle_errors(&err, trx, thr, &savept); thr->lock_state= QUE_THR_LOCK_NOLOCK; if (was_lock_wait) { goto run_again; } trx->op_info = ""; return((int) err); } que_thr_stop_for_mysql_no_error(thr, trx); if (node->is_delete) { if (prebuilt->table->stat_n_rows > 0) { prebuilt->table->stat_n_rows--; } srv_n_rows_deleted++; } else { srv_n_rows_updated++; } row_update_statistics_if_needed(prebuilt->table); trx->op_info = ""; return((int) err); } /************************************************************************* This can only be used when srv_locks_unsafe_for_binlog is TRUE or this session is using a READ COMMITTED isolation level. Before calling this function we must use trx_reset_new_rec_lock_info() and trx_register_new_rec_lock() to store the information which new record locks really were set. This function removes a newly set lock under prebuilt->pcur, and also under prebuilt->clust_pcur. Currently, this is only used and tested in the case of an UPDATE or a DELETE statement, where the row lock is of the LOCK_X type. Thus, this implements a 'mini-rollback' that releases the latest record locks we set. */ int row_unlock_for_mysql( /*=================*/ /* out: error code or DB_SUCCESS */ row_prebuilt_t* prebuilt, /* in: prebuilt struct in MySQL handle */ ibool has_latches_on_recs)/* TRUE if called so that we have the latches on the records under pcur and clust_pcur, and we do not need to reposition the cursors. */ { dict_index_t* index; btr_pcur_t* pcur = prebuilt->pcur; btr_pcur_t* clust_pcur = prebuilt->clust_pcur; trx_t* trx = prebuilt->trx; rec_t* rec; mtr_t mtr; ut_ad(prebuilt && trx); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); if (!(srv_locks_unsafe_for_binlog || trx->isolation_level == TRX_ISO_READ_COMMITTED)) { fprintf(stderr, "InnoDB: Error: calling row_unlock_for_mysql though\n" "InnoDB: srv_locks_unsafe_for_binlog is FALSE and\n" "InnoDB: this session is not using" " READ COMMITTED isolation level.\n"); return(DB_SUCCESS); } trx->op_info = "unlock_row"; index = btr_pcur_get_btr_cur(pcur)->index; if (index != NULL && trx_new_rec_locks_contain(trx, index)) { mtr_start(&mtr); /* Restore the cursor position and find the record */ if (!has_latches_on_recs) { btr_pcur_restore_position(BTR_SEARCH_LEAF, pcur, &mtr); } rec = btr_pcur_get_rec(pcur); lock_rec_unlock(trx, rec, prebuilt->select_lock_type); mtr_commit(&mtr); /* If the search was done through the clustered index, then we have not used clust_pcur at all, and we must NOT try to reset locks on clust_pcur. The values in clust_pcur may be garbage! */ if (index->type & DICT_CLUSTERED) { goto func_exit; } } index = btr_pcur_get_btr_cur(clust_pcur)->index; if (index != NULL && trx_new_rec_locks_contain(trx, index)) { mtr_start(&mtr); /* Restore the cursor position and find the record */ if (!has_latches_on_recs) { btr_pcur_restore_position(BTR_SEARCH_LEAF, clust_pcur, &mtr); } rec = btr_pcur_get_rec(clust_pcur); lock_rec_unlock(trx, rec, prebuilt->select_lock_type); mtr_commit(&mtr); } func_exit: trx->op_info = ""; return(DB_SUCCESS); } /************************************************************************** Does a cascaded delete or set null in a foreign key operation. */ ulint row_update_cascade_for_mysql( /*=========================*/ /* out: error code or DB_SUCCESS */ que_thr_t* thr, /* in: query thread */ upd_node_t* node, /* in: update node used in the cascade or set null operation */ dict_table_t* table) /* in: table where we do the operation */ { ulint err; trx_t* trx; trx = thr_get_trx(thr); run_again: thr->run_node = node; thr->prev_node = node; row_upd_step(thr); err = trx->error_state; /* Note that the cascade node is a subnode of another InnoDB query graph node. We do a normal lock wait in this node, but all errors are handled by the parent node. */ if (err == DB_LOCK_WAIT) { /* Handle lock wait here */ que_thr_stop_for_mysql(thr); srv_suspend_mysql_thread(thr); /* Note that a lock wait may also end in a lock wait timeout, or this transaction is picked as a victim in selective deadlock resolution */ if (trx->error_state != DB_SUCCESS) { return(trx->error_state); } /* Retry operation after a normal lock wait */ goto run_again; } if (err != DB_SUCCESS) { return(err); } if (node->is_delete) { if (table->stat_n_rows > 0) { table->stat_n_rows--; } srv_n_rows_deleted++; } else { srv_n_rows_updated++; } row_update_statistics_if_needed(table); return(err); } /************************************************************************* Checks if a table is such that we automatically created a clustered index on it (on row id). */ ibool row_table_got_default_clust_index( /*==============================*/ dict_table_t* table) { const dict_index_t* clust_index; clust_index = dict_table_get_first_index(table); return(dict_index_get_nth_col(clust_index, 0)->mtype == DATA_SYS); } /************************************************************************* Calculates the key number used inside MySQL for an Innobase index. We have to take into account if we generated a default clustered index for the table */ ulint row_get_mysql_key_number_for_index( /*===============================*/ dict_index_t* index) { dict_index_t* ind; ulint i; ut_a(index); i = 0; ind = dict_table_get_first_index(index->table); while (index != ind) { ind = dict_table_get_next_index(ind); i++; } if (row_table_got_default_clust_index(index->table)) { ut_a(i > 0); i--; } return(i); } /************************************************************************* Locks the data dictionary in shared mode from modifications, for performing foreign key check, rollback, or other operation invisible to MySQL. */ void row_mysql_freeze_data_dictionary( /*=============================*/ trx_t* trx) /* in: transaction */ { ut_a(trx->dict_operation_lock_mode == 0); rw_lock_s_lock(&dict_operation_lock); trx->dict_operation_lock_mode = RW_S_LATCH; } /************************************************************************* Unlocks the data dictionary shared lock. */ void row_mysql_unfreeze_data_dictionary( /*===============================*/ trx_t* trx) /* in: transaction */ { ut_a(trx->dict_operation_lock_mode == RW_S_LATCH); rw_lock_s_unlock(&dict_operation_lock); trx->dict_operation_lock_mode = 0; } /************************************************************************* Locks the data dictionary exclusively for performing a table create or other data dictionary modification operation. */ void row_mysql_lock_data_dictionary( /*===========================*/ trx_t* trx) /* in: transaction */ { ut_a(trx->dict_operation_lock_mode == 0 || trx->dict_operation_lock_mode == RW_X_LATCH); /* Serialize data dictionary operations with dictionary mutex: no deadlocks or lock waits can occur then in these operations */ rw_lock_x_lock(&dict_operation_lock); trx->dict_operation_lock_mode = RW_X_LATCH; mutex_enter(&(dict_sys->mutex)); } /************************************************************************* Unlocks the data dictionary exclusive lock. */ void row_mysql_unlock_data_dictionary( /*=============================*/ trx_t* trx) /* in: transaction */ { ut_a(trx->dict_operation_lock_mode == RW_X_LATCH); /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ mutex_exit(&(dict_sys->mutex)); rw_lock_x_unlock(&dict_operation_lock); trx->dict_operation_lock_mode = 0; } /************************************************************************* Drops a table for MySQL. If the name of the table ends in one of "innodb_monitor", "innodb_lock_monitor", "innodb_tablespace_monitor", "innodb_table_monitor", then this will also start the printing of monitor output by the master thread. If the table name ends in "innodb_mem_validate", InnoDB will try to invoke mem_validate(). */ int row_create_table_for_mysql( /*=======================*/ /* out: error code or DB_SUCCESS */ dict_table_t* table, /* in: table definition */ trx_t* trx) /* in: transaction handle */ { tab_node_t* node; mem_heap_t* heap; que_thr_t* thr; const char* table_name; ulint table_name_len; ulint err; ulint i; ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ ut_ad(mutex_own(&(dict_sys->mutex))); ut_ad(trx->dict_operation_lock_mode == RW_X_LATCH); if (srv_created_new_raw) { fputs("InnoDB: A new raw disk partition was initialized:\n" "InnoDB: we do not allow database modifications" " by the user.\n" "InnoDB: Shut down mysqld and edit my.cnf so that newraw" " is replaced with raw.\n", stderr); dict_mem_table_free(table); trx_commit_for_mysql(trx); return(DB_ERROR); } trx->op_info = "creating table"; if (row_mysql_is_system_table(table->name)) { fprintf(stderr, "InnoDB: Error: trying to create a MySQL system" " table %s of type InnoDB.\n" "InnoDB: MySQL system tables must be" " of the MyISAM type!\n", table->name); dict_mem_table_free(table); trx_commit_for_mysql(trx); return(DB_ERROR); } /* Check that no reserved column names are used. */ for (i = 0; i < dict_table_get_n_user_cols(table); i++) { if (dict_col_name_is_reserved( dict_table_get_col_name(table, i))) { dict_mem_table_free(table); trx_commit_for_mysql(trx); return(DB_ERROR); } } trx_start_if_not_started(trx); /* The table name is prefixed with the database name and a '/'. Certain table names starting with 'innodb_' have their special meaning regardless of the database name. Thus, we need to ignore the database name prefix in the comparisons. */ table_name = strchr(table->name, '/'); ut_a(table_name); table_name++; table_name_len = strlen(table_name) + 1; if (table_name_len == sizeof S_innodb_monitor && !memcmp(table_name, S_innodb_monitor, sizeof S_innodb_monitor)) { /* Table equals "innodb_monitor": start monitor prints */ srv_print_innodb_monitor = TRUE; /* The lock timeout monitor thread also takes care of InnoDB monitor prints */ os_event_set(srv_lock_timeout_thread_event); } else if (table_name_len == sizeof S_innodb_lock_monitor && !memcmp(table_name, S_innodb_lock_monitor, sizeof S_innodb_lock_monitor)) { srv_print_innodb_monitor = TRUE; srv_print_innodb_lock_monitor = TRUE; os_event_set(srv_lock_timeout_thread_event); } else if (table_name_len == sizeof S_innodb_tablespace_monitor && !memcmp(table_name, S_innodb_tablespace_monitor, sizeof S_innodb_tablespace_monitor)) { srv_print_innodb_tablespace_monitor = TRUE; os_event_set(srv_lock_timeout_thread_event); } else if (table_name_len == sizeof S_innodb_table_monitor && !memcmp(table_name, S_innodb_table_monitor, sizeof S_innodb_table_monitor)) { srv_print_innodb_table_monitor = TRUE; os_event_set(srv_lock_timeout_thread_event); } else if (table_name_len == sizeof S_innodb_mem_validate && !memcmp(table_name, S_innodb_mem_validate, sizeof S_innodb_mem_validate)) { /* We define here a debugging feature intended for developers */ fputs("Validating InnoDB memory:\n" "to use this feature you must compile InnoDB with\n" "UNIV_MEM_DEBUG defined in univ.i and" " the server must be\n" "quiet because allocation from a mem heap" " is not protected\n" "by any semaphore.\n", stderr); #ifdef UNIV_MEM_DEBUG ut_a(mem_validate()); fputs("Memory validated\n", stderr); #else /* UNIV_MEM_DEBUG */ fputs("Memory NOT validated (recompile with UNIV_MEM_DEBUG)\n", stderr); #endif /* UNIV_MEM_DEBUG */ } heap = mem_heap_create(512); trx->dict_operation = TRUE; node = tab_create_graph_create(table, heap); thr = pars_complete_graph_for_exec(node, trx, heap); ut_a(thr == que_fork_start_command(que_node_get_parent(thr))); que_run_threads(thr); err = trx->error_state; if (err != DB_SUCCESS) { /* We have special error handling here */ trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); if (err == DB_OUT_OF_FILE_SPACE) { ut_print_timestamp(stderr); fputs(" InnoDB: Warning: cannot create table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs(" because tablespace full\n", stderr); if (dict_table_get_low(table->name)) { row_drop_table_for_mysql(table->name, trx, FALSE); } } else if (err == DB_DUPLICATE_KEY) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs(" already exists in InnoDB internal\n" "InnoDB: data dictionary. Have you deleted" " the .frm file\n" "InnoDB: and not used DROP TABLE?" " Have you used DROP DATABASE\n" "InnoDB: for InnoDB tables in" " MySQL version <= 3.23.43?\n" "InnoDB: See the Restrictions section" " of the InnoDB manual.\n" "InnoDB: You can drop the orphaned table" " inside InnoDB by\n" "InnoDB: creating an InnoDB table with" " the same name in another\n" "InnoDB: database and copying the .frm file" " to the current database.\n" "InnoDB: Then MySQL thinks the table exists," " and DROP TABLE will\n" "InnoDB: succeed.\n" "InnoDB: You can look for further help from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n", stderr); } /* We may also get err == DB_ERROR if the .ibd file for the table already exists */ trx->error_state = DB_SUCCESS; } que_graph_free((que_t*) que_node_get_parent(thr)); trx->op_info = ""; return((int) err); } /************************************************************************* Does an index creation operation for MySQL. TODO: currently failure to create an index results in dropping the whole table! This is no problem currently as all indexes must be created at the same time as the table. */ int row_create_index_for_mysql( /*=======================*/ /* out: error number or DB_SUCCESS */ dict_index_t* index, /* in: index definition */ trx_t* trx, /* in: transaction handle */ const ulint* field_lengths) /* in: if not NULL, must contain dict_index_get_n_fields(index) actual field lengths for the index columns, which are then checked for not being too large. */ { ind_node_t* node; mem_heap_t* heap; que_thr_t* thr; ulint err; ulint i, j; ulint len; #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ ut_ad(mutex_own(&(dict_sys->mutex))); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); trx->op_info = "creating index"; trx_start_if_not_started(trx); /* Check that the same column does not appear twice in the index. Starting from 4.0.14, InnoDB should be able to cope with that, but safer not to allow them. */ for (i = 0; i < dict_index_get_n_fields(index); i++) { for (j = 0; j < i; j++) { if (0 == ut_strcmp( dict_index_get_nth_field(index, j)->name, dict_index_get_nth_field(index, i)->name)) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: column ", stderr); ut_print_name(stderr, trx, FALSE, dict_index_get_nth_field( index, i)->name); fputs(" appears twice in ", stderr); dict_index_name_print(stderr, trx, index); fputs("\n" "InnoDB: This is not allowed" " in InnoDB.\n", stderr); err = DB_COL_APPEARS_TWICE_IN_INDEX; goto error_handling; } } /* Check also that prefix_len and actual length < DICT_MAX_INDEX_COL_LEN */ len = dict_index_get_nth_field(index, i)->prefix_len; if (field_lengths) { len = ut_max(len, field_lengths[i]); } if (len >= DICT_MAX_INDEX_COL_LEN) { err = DB_TOO_BIG_RECORD; goto error_handling; } } heap = mem_heap_create(512); trx->dict_operation = TRUE; /* Note that the space id where we store the index is inherited from the table in dict_build_index_def_step() in dict0crea.c. */ node = ind_create_graph_create(index, heap); thr = pars_complete_graph_for_exec(node, trx, heap); ut_a(thr == que_fork_start_command(que_node_get_parent(thr))); que_run_threads(thr); err = trx->error_state; que_graph_free((que_t*) que_node_get_parent(thr)); error_handling: if (err != DB_SUCCESS) { /* We have special error handling here */ trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); row_drop_table_for_mysql(index->table_name, trx, FALSE); trx->error_state = DB_SUCCESS; } trx->op_info = ""; return((int) err); } /************************************************************************* Scans a table create SQL string and adds to the data dictionary the foreign key constraints declared in the string. This function should be called after the indexes for a table have been created. Each foreign key constraint must be accompanied with indexes in bot participating tables. The indexes are allowed to contain more fields than mentioned in the constraint. Check also that foreign key constraints which reference this table are ok. */ int row_table_add_foreign_constraints( /*==============================*/ /* out: error code or DB_SUCCESS */ trx_t* trx, /* in: transaction */ const char* sql_string, /* in: table create statement where foreign keys are declared like: FOREIGN KEY (a, b) REFERENCES table2(c, d), table2 can be written also with the database name before it: test.table2 */ const char* name, /* in: table full name in the normalized form database_name/table_name */ ibool reject_fks) /* in: if TRUE, fail with error code DB_CANNOT_ADD_CONSTRAINT if any foreign keys are found. */ { ulint err; ut_ad(mutex_own(&(dict_sys->mutex))); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ ut_a(sql_string); trx->op_info = "adding foreign keys"; trx_start_if_not_started(trx); trx->dict_operation = TRUE; err = dict_create_foreign_constraints(trx, sql_string, name, reject_fks); if (err == DB_SUCCESS) { /* Check that also referencing constraints are ok */ err = dict_load_foreigns(name, TRUE); } if (err != DB_SUCCESS) { /* We have special error handling here */ trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); row_drop_table_for_mysql(name, trx, FALSE); trx->error_state = DB_SUCCESS; } return((int) err); } /************************************************************************* Drops a table for MySQL as a background operation. MySQL relies on Unix in ALTER TABLE to the fact that the table handler does not remove the table before all handles to it has been removed. Furhermore, the MySQL's call to drop table must be non-blocking. Therefore we do the drop table as a background operation, which is taken care of by the master thread in srv0srv.c. */ static int row_drop_table_for_mysql_in_background( /*===================================*/ /* out: error code or DB_SUCCESS */ const char* name) /* in: table name */ { ulint error; trx_t* trx; trx = trx_allocate_for_background(); /* If the original transaction was dropping a table referenced by foreign keys, we must set the following to be able to drop the table: */ trx->check_foreigns = FALSE; /* fputs("InnoDB: Error: Dropping table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs(" in background drop list\n", stderr); */ /* Try to drop the table in InnoDB */ error = row_drop_table_for_mysql(name, trx, FALSE); /* Flush the log to reduce probability that the .frm files and the InnoDB data dictionary get out-of-sync if the user runs with innodb_flush_log_at_trx_commit = 0 */ log_buffer_flush_to_disk(); trx_commit_for_mysql(trx); trx_free_for_background(trx); return((int) error); } /************************************************************************* The master thread in srv0srv.c calls this regularly to drop tables which we must drop in background after queries to them have ended. Such lazy dropping of tables is needed in ALTER TABLE on Unix. */ ulint row_drop_tables_for_mysql_in_background(void) /*=========================================*/ /* out: how many tables dropped + remaining tables in list */ { row_mysql_drop_t* drop; dict_table_t* table; ulint n_tables; ulint n_tables_dropped = 0; loop: mutex_enter(&kernel_mutex); if (!row_mysql_drop_list_inited) { UT_LIST_INIT(row_mysql_drop_list); row_mysql_drop_list_inited = TRUE; } drop = UT_LIST_GET_FIRST(row_mysql_drop_list); n_tables = UT_LIST_GET_LEN(row_mysql_drop_list); mutex_exit(&kernel_mutex); if (drop == NULL) { /* All tables dropped */ return(n_tables + n_tables_dropped); } mutex_enter(&(dict_sys->mutex)); table = dict_table_get_low(drop->table_name); mutex_exit(&(dict_sys->mutex)); if (table == NULL) { /* If for some reason the table has already been dropped through some other mechanism, do not try to drop it */ goto already_dropped; } if (DB_SUCCESS != row_drop_table_for_mysql_in_background( drop->table_name)) { /* If the DROP fails for some table, we return, and let the main thread retry later */ return(n_tables + n_tables_dropped); } n_tables_dropped++; already_dropped: mutex_enter(&kernel_mutex); UT_LIST_REMOVE(row_mysql_drop_list, row_mysql_drop_list, drop); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Dropped table %s in background drop queue.\n", drop->table_name); mem_free(drop->table_name); mem_free(drop); mutex_exit(&kernel_mutex); goto loop; } /************************************************************************* Get the background drop list length. NOTE: the caller must own the kernel mutex! */ ulint row_get_background_drop_list_len_low(void) /*======================================*/ /* out: how many tables in list */ { ut_ad(mutex_own(&kernel_mutex)); if (!row_mysql_drop_list_inited) { UT_LIST_INIT(row_mysql_drop_list); row_mysql_drop_list_inited = TRUE; } return(UT_LIST_GET_LEN(row_mysql_drop_list)); } /************************************************************************* If a table is not yet in the drop list, adds the table to the list of tables which the master thread drops in background. We need this on Unix because in ALTER TABLE MySQL may call drop table even if the table has running queries on it. Also, if there are running foreign key checks on the table, we drop the table lazily. */ static ibool row_add_table_to_background_drop_list( /*==================================*/ /* out: TRUE if the table was not yet in the drop list, and was added there */ dict_table_t* table) /* in: table */ { row_mysql_drop_t* drop; mutex_enter(&kernel_mutex); if (!row_mysql_drop_list_inited) { UT_LIST_INIT(row_mysql_drop_list); row_mysql_drop_list_inited = TRUE; } /* Look if the table already is in the drop list */ drop = UT_LIST_GET_FIRST(row_mysql_drop_list); while (drop != NULL) { if (strcmp(drop->table_name, table->name) == 0) { /* Already in the list */ mutex_exit(&kernel_mutex); return(FALSE); } drop = UT_LIST_GET_NEXT(row_mysql_drop_list, drop); } drop = mem_alloc(sizeof(row_mysql_drop_t)); drop->table_name = mem_strdup(table->name); UT_LIST_ADD_LAST(row_mysql_drop_list, row_mysql_drop_list, drop); /* fputs("InnoDB: Adding table ", stderr); ut_print_name(stderr, trx, TRUE, drop->table_name); fputs(" to background drop list\n", stderr); */ mutex_exit(&kernel_mutex); return(TRUE); } #ifndef UNIV_HOTBACKUP /************************************************************************* Discards the tablespace of a table which stored in an .ibd file. Discarding means that this function deletes the .ibd file and assigns a new table id for the table. Also the flag table->ibd_file_missing is set TRUE. */ int row_discard_tablespace_for_mysql( /*=============================*/ /* out: error code or DB_SUCCESS */ const char* name, /* in: table name */ trx_t* trx) /* in: transaction handle */ { dict_foreign_t* foreign; dulint new_id; dict_table_t* table; ibool success; ulint err; pars_info_t* info = NULL; /* How do we prevent crashes caused by ongoing operations on the table? Old operations could try to access non-existent pages. 1) SQL queries, INSERT, SELECT, ...: we must get an exclusive MySQL table lock on the table before we can do DISCARD TABLESPACE. Then there are no running queries on the table. 2) Purge and rollback: we assign a new table id for the table. Since purge and rollback look for the table based on the table id, they see the table as 'dropped' and discard their operations. 3) Insert buffer: we remove all entries for the tablespace in the insert buffer tree; as long as the tablespace mem object does not exist, ongoing insert buffer page merges are discarded in buf0rea.c. If we recreate the tablespace mem object with IMPORT TABLESPACE later, then the tablespace will have the same id, but the tablespace_version field in the mem object is different, and ongoing old insert buffer page merges get discarded. 4) Linear readahead and random readahead: we use the same method as in 3) to discard ongoing operations. 5) FOREIGN KEY operations: if table->n_foreign_key_checks_running > 0, we do not allow the discard. We also reserve the data dictionary latch. */ ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); trx->op_info = "discarding tablespace"; trx_start_if_not_started(trx); /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ row_mysql_lock_data_dictionary(trx); table = dict_table_get_low(name); if (!table) { err = DB_TABLE_NOT_FOUND; goto funct_exit; } if (table->space == 0) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: is in the system tablespace 0" " which cannot be discarded\n", stderr); err = DB_ERROR; goto funct_exit; } if (table->n_foreign_key_checks_running > 0) { ut_print_timestamp(stderr); fputs(" InnoDB: You are trying to DISCARD table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs("\n" "InnoDB: though there is a foreign key check" " running on it.\n" "InnoDB: Cannot discard the table.\n", stderr); err = DB_ERROR; goto funct_exit; } /* Check if the table is referenced by foreign key constraints from some other table (not the table itself) */ foreign = UT_LIST_GET_FIRST(table->referenced_list); while (foreign && foreign->foreign_table == table) { foreign = UT_LIST_GET_NEXT(referenced_list, foreign); } if (foreign && trx->check_foreigns) { FILE* ef = dict_foreign_err_file; /* We only allow discarding a referenced table if FOREIGN_KEY_CHECKS is set to 0 */ err = DB_CANNOT_DROP_CONSTRAINT; mutex_enter(&dict_foreign_err_mutex); rewind(ef); ut_print_timestamp(ef); fputs(" Cannot DISCARD table ", ef); ut_print_name(ef, trx, TRUE, name); fputs("\n" "because it is referenced by ", ef); ut_print_name(ef, trx, TRUE, foreign->foreign_table_name); putc('\n', ef); mutex_exit(&dict_foreign_err_mutex); goto funct_exit; } new_id = dict_hdr_get_new_id(DICT_HDR_TABLE_ID); /* Remove any locks there are on the table or its records */ lock_reset_all_on_table(table); info = pars_info_create(); pars_info_add_str_literal(info, "table_name", name); pars_info_add_dulint_literal(info, "new_id", new_id); err = que_eval_sql(info, "PROCEDURE DISCARD_TABLESPACE_PROC () IS\n" "old_id CHAR;\n" "BEGIN\n" "SELECT ID INTO old_id\n" "FROM SYS_TABLES\n" "WHERE NAME = :table_name\n" "LOCK IN SHARE MODE;\n" "IF (SQL % NOTFOUND) THEN\n" " COMMIT WORK;\n" " RETURN;\n" "END IF;\n" "UPDATE SYS_TABLES SET ID = :new_id\n" " WHERE ID = old_id;\n" "UPDATE SYS_COLUMNS SET TABLE_ID = :new_id\n" " WHERE TABLE_ID = old_id;\n" "UPDATE SYS_INDEXES SET TABLE_ID = :new_id\n" " WHERE TABLE_ID = old_id;\n" "COMMIT WORK;\n" "END;\n" , FALSE, trx); if (err != DB_SUCCESS) { trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; } else { dict_table_change_id_in_cache(table, new_id); success = fil_discard_tablespace(table->space); if (!success) { trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; err = DB_ERROR; } else { /* Set the flag which tells that now it is legal to IMPORT a tablespace for this table */ table->tablespace_discarded = TRUE; table->ibd_file_missing = TRUE; } } funct_exit: trx_commit_for_mysql(trx); row_mysql_unlock_data_dictionary(trx); trx->op_info = ""; return((int) err); } /********************************************************************* Imports a tablespace. The space id in the .ibd file must match the space id of the table in the data dictionary. */ int row_import_tablespace_for_mysql( /*============================*/ /* out: error code or DB_SUCCESS */ const char* name, /* in: table name */ trx_t* trx) /* in: transaction handle */ { dict_table_t* table; ibool success; dulint current_lsn; ulint err = DB_SUCCESS; ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); trx_start_if_not_started(trx); trx->op_info = "importing tablespace"; current_lsn = log_get_lsn(); /* It is possible, though very improbable, that the lsn's in the tablespace to be imported have risen above the current system lsn, if a lengthy purge, ibuf merge, or rollback was performed on a backup taken with ibbackup. If that is the case, reset page lsn's in the file. We assume that mysqld was shut down after it performed these cleanup operations on the .ibd file, so that it stamped the latest lsn to the FIL_PAGE_FILE_FLUSH_LSN in the first page of the .ibd file. TODO: reset also the trx id's in clustered index records and write a new space id to each data page. That would allow us to import clean .ibd files from another MySQL installation. */ success = fil_reset_too_high_lsns(name, current_lsn); if (!success) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: cannot reset lsn's in table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n", stderr); err = DB_ERROR; row_mysql_lock_data_dictionary(trx); goto funct_exit; } /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ row_mysql_lock_data_dictionary(trx); table = dict_table_get_low(name); if (!table) { ut_print_timestamp(stderr); fputs(" InnoDB: table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: does not exist in the InnoDB data dictionary\n" "InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n", stderr); err = DB_TABLE_NOT_FOUND; goto funct_exit; } if (table->space == 0) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: is in the system tablespace 0" " which cannot be imported\n", stderr); err = DB_ERROR; goto funct_exit; } if (!table->tablespace_discarded) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: you are trying to" " IMPORT a tablespace\n" "InnoDB: ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs(", though you have not called DISCARD on it yet\n" "InnoDB: during the lifetime of the mysqld process!\n", stderr); err = DB_ERROR; goto funct_exit; } /* Play safe and remove all insert buffer entries, though we should have removed them already when DISCARD TABLESPACE was called */ ibuf_delete_for_discarded_space(table->space); success = fil_open_single_table_tablespace(TRUE, table->space, table->name); if (success) { table->ibd_file_missing = FALSE; table->tablespace_discarded = FALSE; } else { if (table->ibd_file_missing) { ut_print_timestamp(stderr); fputs(" InnoDB: cannot find or open in the" " database directory the .ibd file of\n" "InnoDB: table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n", stderr); } err = DB_ERROR; } funct_exit: trx_commit_for_mysql(trx); row_mysql_unlock_data_dictionary(trx); trx->op_info = ""; return((int) err); } /************************************************************************* Truncates a table for MySQL. */ int row_truncate_table_for_mysql( /*=========================*/ /* out: error code or DB_SUCCESS */ dict_table_t* table, /* in: table handle */ trx_t* trx) /* in: transaction handle */ { dict_foreign_t* foreign; ulint err; mem_heap_t* heap; byte* buf; dtuple_t* tuple; dfield_t* dfield; dict_index_t* sys_index; btr_pcur_t pcur; mtr_t mtr; dulint new_id; pars_info_t* info = NULL; /* How do we prevent crashes caused by ongoing operations on the table? Old operations could try to access non-existent pages. 1) SQL queries, INSERT, SELECT, ...: we must get an exclusive MySQL table lock on the table before we can do TRUNCATE TABLE. Then there are no running queries on the table. This is guaranteed, because in ha_innobase::store_lock(), we do not weaken the TL_WRITE lock requested by MySQL when executing SQLCOM_TRUNCATE. 2) Purge and rollback: we assign a new table id for the table. Since purge and rollback look for the table based on the table id, they see the table as 'dropped' and discard their operations. 3) Insert buffer: TRUNCATE TABLE is analogous to DROP TABLE, so we do not have to remove insert buffer records, as the insert buffer works at a low level. If a freed page is later reallocated, the allocator will remove the ibuf entries for it. TODO: when we truncate *.ibd files (analogous to DISCARD TABLESPACE), we will have to remove we remove all entries for the table in the insert buffer tree! 4) Linear readahead and random readahead: we use the same method as in 3) to discard ongoing operations. (This will only be relevant for TRUNCATE TABLE by DISCARD TABLESPACE.) 5) FOREIGN KEY operations: if table->n_foreign_key_checks_running > 0, we do not allow the TRUNCATE. We also reserve the data dictionary latch. */ ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); ut_ad(table); if (srv_created_new_raw) { fputs("InnoDB: A new raw disk partition was initialized:\n" "InnoDB: we do not allow database modifications" " by the user.\n" "InnoDB: Shut down mysqld and edit my.cnf so that newraw" " is replaced with raw.\n", stderr); return(DB_ERROR); } trx->op_info = "truncating table"; trx_start_if_not_started(trx); /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ ut_a(trx->dict_operation_lock_mode == 0); /* Prevent foreign key checks etc. while we are truncating the table */ row_mysql_lock_data_dictionary(trx); ut_ad(mutex_own(&(dict_sys->mutex))); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ /* Check if the table is referenced by foreign key constraints from some other table (not the table itself) */ foreign = UT_LIST_GET_FIRST(table->referenced_list); while (foreign && foreign->foreign_table == table) { foreign = UT_LIST_GET_NEXT(referenced_list, foreign); } if (foreign && trx->check_foreigns) { FILE* ef = dict_foreign_err_file; /* We only allow truncating a referenced table if FOREIGN_KEY_CHECKS is set to 0 */ mutex_enter(&dict_foreign_err_mutex); rewind(ef); ut_print_timestamp(ef); fputs(" Cannot truncate table ", ef); ut_print_name(ef, trx, TRUE, table->name); fputs(" by DROP+CREATE\n" "InnoDB: because it is referenced by ", ef); ut_print_name(ef, trx, TRUE, foreign->foreign_table_name); putc('\n', ef); mutex_exit(&dict_foreign_err_mutex); err = DB_ERROR; goto funct_exit; } /* TODO: could we replace the counter n_foreign_key_checks_running with lock checks on the table? Acquire here an exclusive lock on the table, and rewrite lock0lock.c and the lock wait in srv0srv.c so that they can cope with the table having been truncated here? Foreign key checks take an IS or IX lock on the table. */ if (table->n_foreign_key_checks_running > 0) { ut_print_timestamp(stderr); fputs(" InnoDB: Cannot truncate table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs(" by DROP+CREATE\n" "InnoDB: because there is a foreign key check" " running on it.\n", stderr); err = DB_ERROR; goto funct_exit; } /* Remove any locks there are on the table or its records */ lock_reset_all_on_table(table); trx->table_id = table->id; /* scan SYS_INDEXES for all indexes of the table */ heap = mem_heap_create(800); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, table->id); dfield_set_data(dfield, buf, 8); sys_index = dict_table_get_first_index(dict_sys->sys_indexes); dict_index_copy_types(tuple, sys_index, 1); mtr_start(&mtr); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_MODIFY_LEAF, &pcur, &mtr); for (;;) { rec_t* rec; const byte* field; ulint len; ulint root_page_no; if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { /* The end of SYS_INDEXES has been reached. */ break; } rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); if (memcmp(buf, field, len) != 0) { /* End of indexes for the table (TABLE_ID mismatch). */ break; } if (rec_get_deleted_flag(rec, FALSE)) { /* The index has been dropped. */ goto next_rec; } /* This call may commit and restart mtr and reposition pcur. */ root_page_no = dict_truncate_index_tree(table, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (root_page_no != FIL_NULL) { page_rec_write_index_page_no( rec, DICT_SYS_INDEXES_PAGE_NO_FIELD, root_page_no, &mtr); /* We will need to commit and restart the mini-transaction in order to avoid deadlocks. The dict_truncate_index_tree() call has allocated a page in this mini-transaction, and the rest of this loop could latch another index page. */ mtr_commit(&mtr); mtr_start(&mtr); btr_pcur_restore_position(BTR_MODIFY_LEAF, &pcur, &mtr); } next_rec: btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); new_id = dict_hdr_get_new_id(DICT_HDR_TABLE_ID); info = pars_info_create(); pars_info_add_dulint_literal(info, "old_id", table->id); pars_info_add_dulint_literal(info, "new_id", new_id); err = que_eval_sql(info, "PROCEDURE RENUMBER_TABLESPACE_PROC () IS\n" "BEGIN\n" "UPDATE SYS_TABLES SET ID = :new_id\n" " WHERE ID = :old_id;\n" "UPDATE SYS_COLUMNS SET TABLE_ID = :new_id\n" " WHERE TABLE_ID = :old_id;\n" "UPDATE SYS_INDEXES SET TABLE_ID = :new_id\n" " WHERE TABLE_ID = :old_id;\n" "COMMIT WORK;\n" "END;\n" , FALSE, trx); if (err != DB_SUCCESS) { trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; ut_print_timestamp(stderr); fputs(" InnoDB: Unable to assign a new identifier to table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs("\n" "InnoDB: after truncating it. Background processes" " may corrupt the table!\n", stderr); err = DB_ERROR; } else { dict_table_change_id_in_cache(table, new_id); } /* MySQL calls ha_innobase::reset_auto_increment() which does the same thing. */ dict_table_autoinc_lock(table); dict_table_autoinc_initialize(table, 0); dict_table_autoinc_unlock(table); dict_update_statistics(table); trx_commit_for_mysql(trx); funct_exit: row_mysql_unlock_data_dictionary(trx); trx->op_info = ""; srv_wake_master_thread(); return((int) err); } #endif /* !UNIV_HOTBACKUP */ /************************************************************************* Drops a table for MySQL. If the name of the dropped table ends in one of "innodb_monitor", "innodb_lock_monitor", "innodb_tablespace_monitor", "innodb_table_monitor", then this will also stop the printing of monitor output by the master thread. */ int row_drop_table_for_mysql( /*=====================*/ /* out: error code or DB_SUCCESS */ const char* name, /* in: table name */ trx_t* trx, /* in: transaction handle */ ibool drop_db)/* in: TRUE=dropping whole database */ { dict_foreign_t* foreign; dict_table_t* table; ulint space_id; ulint err; const char* table_name; ulint namelen; ibool locked_dictionary = FALSE; pars_info_t* info = NULL; ut_a(name != NULL); if (srv_created_new_raw) { fputs("InnoDB: A new raw disk partition was initialized:\n" "InnoDB: we do not allow database modifications" " by the user.\n" "InnoDB: Shut down mysqld and edit my.cnf so that newraw" " is replaced with raw.\n", stderr); return(DB_ERROR); } trx->op_info = "dropping table"; trx_start_if_not_started(trx); /* The table name is prefixed with the database name and a '/'. Certain table names starting with 'innodb_' have their special meaning regardless of the database name. Thus, we need to ignore the database name prefix in the comparisons. */ table_name = strchr(name, '/'); ut_a(table_name); table_name++; namelen = strlen(table_name) + 1; if (namelen == sizeof S_innodb_monitor && !memcmp(table_name, S_innodb_monitor, sizeof S_innodb_monitor)) { /* Table name equals "innodb_monitor": stop monitor prints */ srv_print_innodb_monitor = FALSE; srv_print_innodb_lock_monitor = FALSE; } else if (namelen == sizeof S_innodb_lock_monitor && !memcmp(table_name, S_innodb_lock_monitor, sizeof S_innodb_lock_monitor)) { srv_print_innodb_monitor = FALSE; srv_print_innodb_lock_monitor = FALSE; } else if (namelen == sizeof S_innodb_tablespace_monitor && !memcmp(table_name, S_innodb_tablespace_monitor, sizeof S_innodb_tablespace_monitor)) { srv_print_innodb_tablespace_monitor = FALSE; } else if (namelen == sizeof S_innodb_table_monitor && !memcmp(table_name, S_innodb_table_monitor, sizeof S_innodb_table_monitor)) { srv_print_innodb_table_monitor = FALSE; } /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ if (trx->dict_operation_lock_mode != RW_X_LATCH) { /* Prevent foreign key checks etc. while we are dropping the table */ row_mysql_lock_data_dictionary(trx); locked_dictionary = TRUE; } ut_ad(mutex_own(&(dict_sys->mutex))); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ table = dict_table_get_low(name); if (!table) { err = DB_TABLE_NOT_FOUND; ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs(" does not exist in the InnoDB internal\n" "InnoDB: data dictionary though MySQL is" " trying to drop it.\n" "InnoDB: Have you copied the .frm file" " of the table to the\n" "InnoDB: MySQL database directory" " from another database?\n" "InnoDB: You can look for further help from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n", stderr); goto funct_exit; } /* Check if the table is referenced by foreign key constraints from some other table (not the table itself) */ foreign = UT_LIST_GET_FIRST(table->referenced_list); while (foreign && foreign->foreign_table == table) { check_next_foreign: foreign = UT_LIST_GET_NEXT(referenced_list, foreign); } if (foreign && trx->check_foreigns && !(drop_db && dict_tables_have_same_db( name, foreign->foreign_table_name))) { FILE* ef = dict_foreign_err_file; /* We only allow dropping a referenced table if FOREIGN_KEY_CHECKS is set to 0 */ err = DB_CANNOT_DROP_CONSTRAINT; mutex_enter(&dict_foreign_err_mutex); rewind(ef); ut_print_timestamp(ef); fputs(" Cannot drop table ", ef); ut_print_name(ef, trx, TRUE, name); fputs("\n" "because it is referenced by ", ef); ut_print_name(ef, trx, TRUE, foreign->foreign_table_name); putc('\n', ef); mutex_exit(&dict_foreign_err_mutex); goto funct_exit; } if (foreign && trx->check_foreigns) { goto check_next_foreign; } if (table->n_mysql_handles_opened > 0) { ibool added; added = row_add_table_to_background_drop_list(table); if (added) { ut_print_timestamp(stderr); fputs(" InnoDB: Warning: MySQL is" " trying to drop table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs("\n" "InnoDB: though there are still" " open handles to it.\n" "InnoDB: Adding the table to the" " background drop queue.\n", stderr); /* We return DB_SUCCESS to MySQL though the drop will happen lazily later */ err = DB_SUCCESS; } else { /* The table is already in the background drop list */ err = DB_ERROR; } goto funct_exit; } /* TODO: could we replace the counter n_foreign_key_checks_running with lock checks on the table? Acquire here an exclusive lock on the table, and rewrite lock0lock.c and the lock wait in srv0srv.c so that they can cope with the table having been dropped here? Foreign key checks take an IS or IX lock on the table. */ if (table->n_foreign_key_checks_running > 0) { ibool added; added = row_add_table_to_background_drop_list(table); if (added) { ut_print_timestamp(stderr); fputs(" InnoDB: You are trying to drop table ", stderr); ut_print_name(stderr, trx, TRUE, table->name); fputs("\n" "InnoDB: though there is a" " foreign key check running on it.\n" "InnoDB: Adding the table to" " the background drop queue.\n", stderr); /* We return DB_SUCCESS to MySQL though the drop will happen lazily later */ err = DB_SUCCESS; } else { /* The table is already in the background drop list */ err = DB_ERROR; } goto funct_exit; } /* Remove any locks there are on the table or its records */ lock_reset_all_on_table(table); trx->dict_operation = TRUE; trx->table_id = table->id; /* We use the private SQL parser of Innobase to generate the query graphs needed in deleting the dictionary data from system tables in Innobase. Deleting a row from SYS_INDEXES table also frees the file segments of the B-tree associated with the index. */ info = pars_info_create(); pars_info_add_str_literal(info, "table_name", name); err = que_eval_sql(info, "PROCEDURE DROP_TABLE_PROC () IS\n" "sys_foreign_id CHAR;\n" "table_id CHAR;\n" "index_id CHAR;\n" "foreign_id CHAR;\n" "found INT;\n" "BEGIN\n" "SELECT ID INTO table_id\n" "FROM SYS_TABLES\n" "WHERE NAME = :table_name\n" "LOCK IN SHARE MODE;\n" "IF (SQL % NOTFOUND) THEN\n" " COMMIT WORK;\n" " RETURN;\n" "END IF;\n" "found := 1;\n" "SELECT ID INTO sys_foreign_id\n" "FROM SYS_TABLES\n" "WHERE NAME = 'SYS_FOREIGN'\n" "LOCK IN SHARE MODE;\n" "IF (SQL % NOTFOUND) THEN\n" " found := 0;\n" "END IF;\n" "IF (:table_name = 'SYS_FOREIGN') THEN\n" " found := 0;\n" "END IF;\n" "IF (:table_name = 'SYS_FOREIGN_COLS') THEN\n" " found := 0;\n" "END IF;\n" "WHILE found = 1 LOOP\n" " SELECT ID INTO foreign_id\n" " FROM SYS_FOREIGN\n" " WHERE FOR_NAME = :table_name\n" " AND TO_BINARY(FOR_NAME)\n" " = TO_BINARY(:table_name)\n" " LOCK IN SHARE MODE;\n" " IF (SQL % NOTFOUND) THEN\n" " found := 0;\n" " ELSE\n" " DELETE FROM SYS_FOREIGN_COLS\n" " WHERE ID = foreign_id;\n" " DELETE FROM SYS_FOREIGN\n" " WHERE ID = foreign_id;\n" " END IF;\n" "END LOOP;\n" "found := 1;\n" "WHILE found = 1 LOOP\n" " SELECT ID INTO index_id\n" " FROM SYS_INDEXES\n" " WHERE TABLE_ID = table_id\n" " LOCK IN SHARE MODE;\n" " IF (SQL % NOTFOUND) THEN\n" " found := 0;\n" " ELSE\n" " DELETE FROM SYS_FIELDS\n" " WHERE INDEX_ID = index_id;\n" " DELETE FROM SYS_INDEXES\n" " WHERE ID = index_id\n" " AND TABLE_ID = table_id;\n" " END IF;\n" "END LOOP;\n" "DELETE FROM SYS_COLUMNS\n" "WHERE TABLE_ID = table_id;\n" "DELETE FROM SYS_TABLES\n" "WHERE ID = table_id;\n" "COMMIT WORK;\n" "END;\n" , FALSE, trx); if (err != DB_SUCCESS) { ut_a(err == DB_OUT_OF_FILE_SPACE); err = DB_MUST_GET_MORE_FILE_SPACE; row_mysql_handle_errors(&err, trx, NULL, NULL); ut_error; } else { ibool is_path; const char* name_or_path; mem_heap_t* heap; heap = mem_heap_create(200); /* Clone the name, in case it has been allocated from table->heap, which will be freed by dict_table_remove_from_cache(table) below. */ name = mem_heap_strdup(heap, name); space_id = table->space; if (table->dir_path_of_temp_table != NULL) { is_path = TRUE; name_or_path = mem_heap_strdup( heap, table->dir_path_of_temp_table); } else { is_path = FALSE; name_or_path = name; } dict_table_remove_from_cache(table); if (dict_load_table(name) != NULL) { ut_print_timestamp(stderr); fputs(" InnoDB: Error: not able to remove table ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs(" from the dictionary cache!\n", stderr); err = DB_ERROR; } /* Do not drop possible .ibd tablespace if something went wrong: we do not want to delete valuable data of the user */ if (err == DB_SUCCESS && space_id > 0) { if (!fil_space_for_table_exists_in_mem(space_id, name_or_path, is_path, FALSE, TRUE)) { err = DB_SUCCESS; fprintf(stderr, "InnoDB: We removed now the InnoDB" " internal data dictionary entry\n" "InnoDB: of table "); ut_print_name(stderr, trx, TRUE, name); fprintf(stderr, ".\n"); } else if (!fil_delete_tablespace(space_id)) { fprintf(stderr, "InnoDB: We removed now the InnoDB" " internal data dictionary entry\n" "InnoDB: of table "); ut_print_name(stderr, trx, TRUE, name); fprintf(stderr, ".\n"); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: not able to" " delete tablespace %lu of table ", (ulong) space_id); ut_print_name(stderr, trx, TRUE, name); fputs("!\n", stderr); err = DB_ERROR; } } mem_heap_free(heap); } funct_exit: trx_commit_for_mysql(trx); if (locked_dictionary) { row_mysql_unlock_data_dictionary(trx); } trx->op_info = ""; #ifndef UNIV_HOTBACKUP srv_wake_master_thread(); #endif /* !UNIV_HOTBACKUP */ return((int) err); } /************************************************************************* Drops a database for MySQL. */ int row_drop_database_for_mysql( /*========================*/ /* out: error code or DB_SUCCESS */ const char* name, /* in: database name which ends to '/' */ trx_t* trx) /* in: transaction handle */ { dict_table_t* table; char* table_name; int err = DB_SUCCESS; ulint namelen = strlen(name); ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); ut_a(name != NULL); ut_a(name[namelen - 1] == '/'); trx->op_info = "dropping database"; trx_start_if_not_started(trx); loop: row_mysql_lock_data_dictionary(trx); while ((table_name = dict_get_first_table_name_in_db(name))) { ut_a(memcmp(table_name, name, namelen) == 0); table = dict_table_get_low(table_name); ut_a(table); /* Wait until MySQL does not have any queries running on the table */ if (table->n_mysql_handles_opened > 0) { row_mysql_unlock_data_dictionary(trx); ut_print_timestamp(stderr); fputs(" InnoDB: Warning: MySQL is trying to" " drop database ", stderr); ut_print_name(stderr, trx, TRUE, name); fputs("\n" "InnoDB: though there are still" " open handles to table ", stderr); ut_print_name(stderr, trx, TRUE, table_name); fputs(".\n", stderr); os_thread_sleep(1000000); mem_free(table_name); goto loop; } err = row_drop_table_for_mysql(table_name, trx, TRUE); mem_free(table_name); if (err != DB_SUCCESS) { fputs("InnoDB: DROP DATABASE ", stderr); ut_print_name(stderr, trx, TRUE, name); fprintf(stderr, " failed with error %lu for table ", (ulint) err); ut_print_name(stderr, trx, TRUE, table_name); putc('\n', stderr); break; } } trx_commit_for_mysql(trx); row_mysql_unlock_data_dictionary(trx); trx->op_info = ""; return(err); } /************************************************************************* Checks if a table name contains the string "/#sql" which denotes temporary tables in MySQL. */ static ibool row_is_mysql_tmp_table_name( /*========================*/ /* out: TRUE if temporary table */ const char* name) /* in: table name in the form 'database/tablename' */ { return(strstr(name, "/#sql") != NULL); /* return(strstr(name, "/@0023sql") != NULL); */ } /******************************************************************** Delete a single constraint. */ static int row_delete_constraint_low( /*======================*/ /* out: error code or DB_SUCCESS */ const char* id, /* in: constraint id */ trx_t* trx) /* in: transaction handle */ { pars_info_t* info = pars_info_create(); pars_info_add_str_literal(info, "id", id); return((int) que_eval_sql(info, "PROCEDURE DELETE_CONSTRAINT () IS\n" "BEGIN\n" "DELETE FROM SYS_FOREIGN_COLS WHERE ID = :id;\n" "DELETE FROM SYS_FOREIGN WHERE ID = :id;\n" "END;\n" , FALSE, trx)); } /******************************************************************** Delete a single constraint. */ static int row_delete_constraint( /*==================*/ /* out: error code or DB_SUCCESS */ const char* id, /* in: constraint id */ const char* database_name, /* in: database name, with the trailing '/' */ mem_heap_t* heap, /* in: memory heap */ trx_t* trx) /* in: transaction handle */ { ulint err; /* New format constraints have ids /. */ err = row_delete_constraint_low( mem_heap_strcat(heap, database_name, id), trx); if ((err == DB_SUCCESS) && !strchr(id, '/')) { /* Old format < 4.0.18 constraints have constraint ids _. We only try deleting them if the constraint name does not contain a '/' character, otherwise deleting a new format constraint named 'foo/bar' from database 'baz' would remove constraint 'bar' from database 'foo', if it existed. */ err = row_delete_constraint_low(id, trx); } return((int) err); } /************************************************************************* Renames a table for MySQL. */ int row_rename_table_for_mysql( /*=======================*/ /* out: error code or DB_SUCCESS */ const char* old_name, /* in: old table name */ const char* new_name, /* in: new table name */ trx_t* trx) /* in: transaction handle */ { dict_table_t* table; ulint err; mem_heap_t* heap = NULL; const char** constraints_to_drop = NULL; ulint n_constraints_to_drop = 0; ibool old_is_tmp, new_is_tmp; pars_info_t* info = NULL; ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); ut_a(old_name != NULL); ut_a(new_name != NULL); if (srv_created_new_raw || srv_force_recovery) { fputs("InnoDB: A new raw disk partition was initialized or\n" "InnoDB: innodb_force_recovery is on: we do not allow\n" "InnoDB: database modifications by the user. Shut down\n" "InnoDB: mysqld and edit my.cnf so that newraw" " is replaced\n" "InnoDB: with raw, and innodb_force_... is removed.\n", stderr); trx_commit_for_mysql(trx); return(DB_ERROR); } if (row_mysql_is_system_table(new_name)) { fprintf(stderr, "InnoDB: Error: trying to create a MySQL" " system table %s of type InnoDB.\n" "InnoDB: MySQL system tables must be" " of the MyISAM type!\n", new_name); trx_commit_for_mysql(trx); return(DB_ERROR); } trx->op_info = "renaming table"; trx_start_if_not_started(trx); old_is_tmp = row_is_mysql_tmp_table_name(old_name); new_is_tmp = row_is_mysql_tmp_table_name(new_name); /* Serialize data dictionary operations with dictionary mutex: no deadlocks can occur then in these operations */ row_mysql_lock_data_dictionary(trx); table = dict_table_get_low(old_name); if (!table) { err = DB_TABLE_NOT_FOUND; ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, old_name); fputs(" does not exist in the InnoDB internal\n" "InnoDB: data dictionary though MySQL is" " trying to rename the table.\n" "InnoDB: Have you copied the .frm file" " of the table to the\n" "InnoDB: MySQL database directory" " from another database?\n" "InnoDB: You can look for further help from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n", stderr); goto funct_exit; } if (table->ibd_file_missing) { err = DB_TABLE_NOT_FOUND; ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_name(stderr, trx, TRUE, old_name); fputs(" does not have an .ibd file" " in the database directory.\n" "InnoDB: You can look for further help from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n", stderr); goto funct_exit; } if (new_is_tmp) { /* MySQL is doing an ALTER TABLE command and it renames the original table to a temporary table name. We want to preserve the original foreign key constraint definitions despite the name change. An exception is those constraints for which the ALTER TABLE contained DROP FOREIGN KEY .*/ heap = mem_heap_create(100); err = dict_foreign_parse_drop_constraints( heap, trx, table, &n_constraints_to_drop, &constraints_to_drop); if (err != DB_SUCCESS) { goto funct_exit; } } /* We use the private SQL parser of Innobase to generate the query graphs needed in deleting the dictionary data from system tables in Innobase. Deleting a row from SYS_INDEXES table also frees the file segments of the B-tree associated with the index. */ info = pars_info_create(); pars_info_add_str_literal(info, "new_table_name", new_name); pars_info_add_str_literal(info, "old_table_name", old_name); err = que_eval_sql(info, "PROCEDURE RENAME_TABLE () IS\n" "BEGIN\n" "UPDATE SYS_TABLES SET NAME = :new_table_name\n" " WHERE NAME = :old_table_name;\n" "END;\n" , FALSE, trx); if (err != DB_SUCCESS) { goto end; } if (!new_is_tmp) { /* Rename all constraints. */ info = pars_info_create(); pars_info_add_str_literal(info, "new_table_name", new_name); pars_info_add_str_literal(info, "old_table_name", old_name); err = que_eval_sql( info, "PROCEDURE RENAME_CONSTRAINT_IDS () IS\n" "gen_constr_prefix CHAR;\n" "new_db_name CHAR;\n" "foreign_id CHAR;\n" "new_foreign_id CHAR;\n" "old_db_name_len INT;\n" "old_t_name_len INT;\n" "new_db_name_len INT;\n" "id_len INT;\n" "found INT;\n" "BEGIN\n" "found := 1;\n" "old_db_name_len := INSTR(:old_table_name, '/')-1;\n" "new_db_name_len := INSTR(:new_table_name, '/')-1;\n" "new_db_name := SUBSTR(:new_table_name, 0,\n" " new_db_name_len);\n" "old_t_name_len := LENGTH(:old_table_name);\n" "gen_constr_prefix := CONCAT(:old_table_name,\n" " '_ibfk_');\n" "WHILE found = 1 LOOP\n" " SELECT ID INTO foreign_id\n" " FROM SYS_FOREIGN\n" " WHERE FOR_NAME = :old_table_name\n" " AND TO_BINARY(FOR_NAME)\n" " = TO_BINARY(:old_table_name)\n" " LOCK IN SHARE MODE;\n" " IF (SQL % NOTFOUND) THEN\n" " found := 0;\n" " ELSE\n" " UPDATE SYS_FOREIGN\n" " SET FOR_NAME = :new_table_name\n" " WHERE ID = foreign_id;\n" " id_len := LENGTH(foreign_id);\n" " IF (INSTR(foreign_id, '/') > 0) THEN\n" " IF (INSTR(foreign_id,\n" " gen_constr_prefix) > 0)\n" " THEN\n" " new_foreign_id :=\n" " CONCAT(:new_table_name,\n" " SUBSTR(foreign_id, old_t_name_len,\n" " id_len - old_t_name_len));\n" " ELSE\n" " new_foreign_id :=\n" " CONCAT(new_db_name,\n" " SUBSTR(foreign_id,\n" " old_db_name_len,\n" " id_len - old_db_name_len));\n" " END IF;\n" " UPDATE SYS_FOREIGN\n" " SET ID = new_foreign_id\n" " WHERE ID = foreign_id;\n" " UPDATE SYS_FOREIGN_COLS\n" " SET ID = new_foreign_id\n" " WHERE ID = foreign_id;\n" " END IF;\n" " END IF;\n" "END LOOP;\n" "UPDATE SYS_FOREIGN SET REF_NAME = :new_table_name\n" "WHERE REF_NAME = :old_table_name\n" " AND TO_BINARY(REF_NAME)\n" " = TO_BINARY(:old_table_name);\n" "END;\n" , FALSE, trx); } else if (n_constraints_to_drop > 0) { /* Drop some constraints of tmp tables. */ ulint db_name_len = dict_get_db_name_len(old_name) + 1; char* db_name = mem_heap_strdupl(heap, old_name, db_name_len); ulint i; for (i = 0; i < n_constraints_to_drop; i++) { err = row_delete_constraint(constraints_to_drop[i], db_name, heap, trx); if (err != DB_SUCCESS) { break; } } } end: if (err != DB_SUCCESS) { if (err == DB_DUPLICATE_KEY) { ut_print_timestamp(stderr); fputs(" InnoDB: Error; possible reasons:\n" "InnoDB: 1) Table rename would cause" " two FOREIGN KEY constraints\n" "InnoDB: to have the same internal name" " in case-insensitive comparison.\n" "InnoDB: 2) table ", stderr); ut_print_name(stderr, trx, TRUE, new_name); fputs(" exists in the InnoDB internal data\n" "InnoDB: dictionary though MySQL is" " trying to rename table ", stderr); ut_print_name(stderr, trx, TRUE, old_name); fputs(" to it.\n" "InnoDB: Have you deleted the .frm file" " and not used DROP TABLE?\n" "InnoDB: You can look for further help from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n" "InnoDB: If table ", stderr); ut_print_name(stderr, trx, TRUE, new_name); fputs(" is a temporary table #sql..., then" " it can be that\n" "InnoDB: there are still queries running" " on the table, and it will be\n" "InnoDB: dropped automatically when" " the queries end.\n" "InnoDB: You can drop the orphaned table" " inside InnoDB by\n" "InnoDB: creating an InnoDB table with" " the same name in another\n" "InnoDB: database and copying the .frm file" " to the current database.\n" "InnoDB: Then MySQL thinks the table exists," " and DROP TABLE will\n" "InnoDB: succeed.\n", stderr); } trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; } else { /* The following call will also rename the .ibd data file if the table is stored in a single-table tablespace */ ibool success = dict_table_rename_in_cache(table, new_name, !new_is_tmp); if (!success) { trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; ut_print_timestamp(stderr); fputs(" InnoDB: Error in table rename," " cannot rename ", stderr); ut_print_name(stderr, trx, TRUE, old_name); fputs(" to ", stderr); ut_print_name(stderr, trx, TRUE, new_name); putc('\n', stderr); err = DB_ERROR; goto funct_exit; } /* We only want to switch off some of the type checking in an ALTER, not in a RENAME. */ err = dict_load_foreigns( new_name, old_is_tmp ? trx->check_foreigns : TRUE); if (err != DB_SUCCESS) { ut_print_timestamp(stderr); if (old_is_tmp) { fputs(" InnoDB: Error: in ALTER TABLE ", stderr); ut_print_name(stderr, trx, TRUE, new_name); fputs("\n" "InnoDB: has or is referenced" " in foreign key constraints\n" "InnoDB: which are not compatible" " with the new table definition.\n", stderr); } else { fputs(" InnoDB: Error: in RENAME TABLE" " table ", stderr); ut_print_name(stderr, trx, TRUE, new_name); fputs("\n" "InnoDB: is referenced in" " foreign key constraints\n" "InnoDB: which are not compatible" " with the new table definition.\n", stderr); } ut_a(dict_table_rename_in_cache(table, old_name, FALSE)); trx->error_state = DB_SUCCESS; trx_general_rollback_for_mysql(trx, FALSE, NULL); trx->error_state = DB_SUCCESS; } } funct_exit: trx_commit_for_mysql(trx); row_mysql_unlock_data_dictionary(trx); if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } trx->op_info = ""; return((int) err); } /************************************************************************* Checks that the index contains entries in an ascending order, unique constraint is not broken, and calculates the number of index entries in the read view of the current transaction. */ static ibool row_scan_and_check_index( /*=====================*/ /* out: TRUE if ok */ row_prebuilt_t* prebuilt, /* in: prebuilt struct in MySQL */ dict_index_t* index, /* in: index */ ulint* n_rows) /* out: number of entries seen in the current consistent read */ { dtuple_t* prev_entry = NULL; ulint matched_fields; ulint matched_bytes; byte* buf; ulint ret; rec_t* rec; ibool is_ok = TRUE; int cmp; ibool contains_null; ulint i; ulint cnt; mem_heap_t* heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; *offsets_ = (sizeof offsets_) / sizeof *offsets_; *n_rows = 0; buf = mem_alloc(UNIV_PAGE_SIZE); heap = mem_heap_create(100); /* Make a dummy template in prebuilt, which we will use in scanning the index entries */ prebuilt->index = index; prebuilt->sql_stat_start = TRUE; prebuilt->template_type = ROW_MYSQL_DUMMY_TEMPLATE; prebuilt->n_template = 0; prebuilt->need_to_access_clustered = FALSE; dtuple_set_n_fields(prebuilt->search_tuple, 0); prebuilt->select_lock_type = LOCK_NONE; cnt = 1000; ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, 0); loop: /* Check thd->killed every 1,000 scanned rows */ if (--cnt == 0) { if (trx_is_interrupted(prebuilt->trx)) { goto func_exit; } cnt = 1000; } if (ret != DB_SUCCESS) { func_exit: mem_free(buf); mem_heap_free(heap); return(is_ok); } *n_rows = *n_rows + 1; /* row_search... returns the index record in buf, record origin offset within buf stored in the first 4 bytes, because we have built a dummy template */ rec = buf + mach_read_from_4(buf); if (prev_entry != NULL) { matched_fields = 0; matched_bytes = 0; offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED, &heap); cmp = cmp_dtuple_rec_with_match(prev_entry, rec, offsets, &matched_fields, &matched_bytes); contains_null = FALSE; /* In a unique secondary index we allow equal key values if they contain SQL NULLs */ for (i = 0; i < dict_index_get_n_ordering_defined_by_user(index); i++) { if (UNIV_SQL_NULL == dfield_get_len( dtuple_get_nth_field(prev_entry, i))) { contains_null = TRUE; } } if (cmp > 0) { fputs("InnoDB: index records in a wrong order in ", stderr); not_ok: dict_index_name_print(stderr, prebuilt->trx, index); fputs("\n" "InnoDB: prev record ", stderr); dtuple_print(stderr, prev_entry); fputs("\n" "InnoDB: record ", stderr); rec_print_new(stderr, rec, offsets); putc('\n', stderr); is_ok = FALSE; } else if ((index->type & DICT_UNIQUE) && !contains_null && matched_fields >= dict_index_get_n_ordering_defined_by_user( index)) { fputs("InnoDB: duplicate key in ", stderr); goto not_ok; } } mem_heap_empty(heap); offsets = offsets_; prev_entry = row_rec_to_index_entry(ROW_COPY_DATA, index, rec, heap); ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, ROW_SEL_NEXT); goto loop; } /************************************************************************* Checks a table for corruption. */ ulint row_check_table_for_mysql( /*======================*/ /* out: DB_ERROR or DB_SUCCESS */ row_prebuilt_t* prebuilt) /* in: prebuilt struct in MySQL handle */ { dict_table_t* table = prebuilt->table; dict_index_t* index; ulint n_rows; ulint n_rows_in_table = ULINT_UNDEFINED; ulint ret = DB_SUCCESS; ulint old_isolation_level; if (prebuilt->table->ibd_file_missing) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error:\n" "InnoDB: MySQL is trying to use a table handle" " but the .ibd file for\n" "InnoDB: table %s does not exist.\n" "InnoDB: Have you deleted the .ibd file" " from the database directory under\n" "InnoDB: the MySQL datadir, or have you" " used DISCARD TABLESPACE?\n" "InnoDB: Look from\n" "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/" "innodb-troubleshooting.html\n" "InnoDB: how you can resolve the problem.\n", prebuilt->table->name); return(DB_ERROR); } prebuilt->trx->op_info = "checking table"; old_isolation_level = prebuilt->trx->isolation_level; /* We must run the index record counts at an isolation level >= READ COMMITTED, because a dirty read can see a wrong number of records in some index; to play safe, we use always REPEATABLE READ here */ prebuilt->trx->isolation_level = TRX_ISO_REPEATABLE_READ; /* Enlarge the fatal lock wait timeout during CHECK TABLE. */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold += 7200; /* 2 hours */ mutex_exit(&kernel_mutex); index = dict_table_get_first_index(table); while (index != NULL) { /* fputs("Validating index ", stderr); ut_print_name(stderr, trx, FALSE, index->name); putc('\n', stderr); */ if (!btr_validate_index(index, prebuilt->trx)) { ret = DB_ERROR; } else { if (!row_scan_and_check_index(prebuilt, index, &n_rows)) { ret = DB_ERROR; } if (trx_is_interrupted(prebuilt->trx)) { break; } /* fprintf(stderr, "%lu entries in index %s\n", n_rows, index->name); */ if (index == dict_table_get_first_index(table)) { n_rows_in_table = n_rows; } else if (n_rows != n_rows_in_table) { ret = DB_ERROR; fputs("Error: ", stderr); dict_index_name_print(stderr, prebuilt->trx, index); fprintf(stderr, " contains %lu entries," " should be %lu\n", (ulong) n_rows, (ulong) n_rows_in_table); } } index = dict_table_get_next_index(index); } /* Restore the original isolation level */ prebuilt->trx->isolation_level = old_isolation_level; /* We validate also the whole adaptive hash index for all tables at every CHECK TABLE */ if (!btr_search_validate()) { ret = DB_ERROR; } /* Restore the fatal lock wait timeout after CHECK TABLE. */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold -= 7200; /* 2 hours */ mutex_exit(&kernel_mutex); prebuilt->trx->op_info = ""; return(ret); }