83
83
show variables like 'max_join_size';
84
84
Variable_name Value
86
select * from data_dictionary.session_variables where variable_name like 'max_join_size';
86
select * from information_schema.session_variables where variable_name like 'max_join_size';
87
87
VARIABLE_NAME VARIABLE_VALUE
89
89
show global variables like 'max_join_size';
90
90
Variable_name Value
92
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
92
select * from information_schema.global_variables where variable_name like 'max_join_size';
93
93
VARIABLE_NAME VARIABLE_VALUE
95
95
set GLOBAL max_join_size=2000;
96
96
show global variables like 'max_join_size';
97
97
Variable_name Value
99
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
99
select * from information_schema.global_variables where variable_name like 'max_join_size';
100
100
VARIABLE_NAME VARIABLE_VALUE
102
102
set max_join_size=DEFAULT;
103
103
show variables like 'max_join_size';
104
104
Variable_name Value
105
105
max_join_size 2000
106
select * from data_dictionary.session_variables where variable_name like 'max_join_size';
106
select * from information_schema.session_variables where variable_name like 'max_join_size';
107
107
VARIABLE_NAME VARIABLE_VALUE
109
109
set GLOBAL max_join_size=DEFAULT;
110
110
show global variables like 'max_join_size';
111
111
Variable_name Value
112
112
max_join_size 2147483647
113
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
113
select * from information_schema.global_variables where variable_name like 'max_join_size';
114
114
VARIABLE_NAME VARIABLE_VALUE
115
max_join_size 2147483647
115
MAX_JOIN_SIZE 2147483647
116
116
set @@max_join_size=1000, @@global.max_join_size=2000;
117
117
select @@local.max_join_size, @@global.max_join_size;
118
118
@@local.max_join_size @@global.max_join_size
143
143
show variables like 'timed_mutexes';
144
144
Variable_name Value
146
select * from data_dictionary.session_variables where variable_name like 'timed_mutexes';
146
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
147
147
VARIABLE_NAME VARIABLE_VALUE
149
149
set global timed_mutexes=0;
150
150
show variables like 'timed_mutexes';
151
151
Variable_name Value
152
152
timed_mutexes OFF
153
select * from data_dictionary.session_variables where variable_name like 'timed_mutexes';
153
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
154
154
VARIABLE_NAME VARIABLE_VALUE
156
set storage_engine=MYISAM, storage_engine="MEMORY";
156
set storage_engine=MYISAM, storage_engine="HEAP";
157
157
show local variables like 'storage_engine';
158
158
Variable_name Value
159
159
storage_engine MEMORY
160
select * from data_dictionary.session_variables where variable_name like 'storage_engine';
160
select * from information_schema.session_variables where variable_name like 'storage_engine';
161
161
VARIABLE_NAME VARIABLE_VALUE
162
storage_engine MEMORY
162
STORAGE_ENGINE MEMORY
163
163
show global variables like 'storage_engine';
164
164
Variable_name Value
165
165
storage_engine InnoDB
166
select * from data_dictionary.global_variables where variable_name like 'storage_engine';
166
select * from information_schema.global_variables where variable_name like 'storage_engine';
167
167
VARIABLE_NAME VARIABLE_VALUE
168
storage_engine InnoDB
168
STORAGE_ENGINE InnoDB
169
169
set GLOBAL myisam_max_sort_file_size=2000000;
170
170
show global variables like 'myisam_max_sort_file_size';
171
171
Variable_name Value
172
172
myisam_max_sort_file_size 2000000
173
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
173
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
174
174
VARIABLE_NAME VARIABLE_VALUE
175
myisam_max_sort_file_size 2000000
175
MYISAM_MAX_SORT_FILE_SIZE 2000000
176
176
set GLOBAL myisam_max_sort_file_size=default;
177
177
show global variables like 'myisam_max_sort_file_size';
178
178
Variable_name Value
179
179
myisam_max_sort_file_size 2147483647
180
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
181
VARIABLE_NAME VARIABLE_VALUE
182
myisam_max_sort_file_size 2147483647
183
set global mysql_protocol_buffer_length=1024;
184
show global variables like 'mysql_protocol_buffer_%';
186
mysql_protocol_buffer_length 1024
187
select * from data_dictionary.global_variables where variable_name like 'mysql_protocol_buffer_%';
188
VARIABLE_NAME VARIABLE_VALUE
189
mysql_protocol_buffer_length 1024
190
show global variables like 'mysql_protocol_buffer_%';
192
mysql_protocol_buffer_length 1024
193
select * from data_dictionary.global_variables where variable_name like 'mysql_protocol_buffer_%';
194
VARIABLE_NAME VARIABLE_VALUE
195
mysql_protocol_buffer_length 1024
196
set global mysql_protocol_buffer_length=1;
198
Error 1524 Error setting mysql_protocol_buffer_length. Given value 1 (< 1024)
199
show variables like 'mysql_protocol_buffer_length';
201
mysql_protocol_buffer_length 1024
202
set global mysql_protocol_buffer_length=2000000000;
204
Error 1524 Error setting mysql_protocol_buffer_length. Given value 2000000000 (> 1048576)
205
show variables like 'mysql_protocol_buffer_length';
207
mysql_protocol_buffer_length 1024
180
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
181
VARIABLE_NAME VARIABLE_VALUE
182
MYISAM_MAX_SORT_FILE_SIZE 2147483647
183
set global net_buffer_length=1024;
184
set session net_buffer_length=2048;
185
show global variables like 'net_%';
187
net_buffer_length 1024
188
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
189
VARIABLE_NAME VARIABLE_VALUE
190
NET_BUFFER_LENGTH 1024
191
show session variables like 'net_%';
193
net_buffer_length 2048
194
select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
195
VARIABLE_NAME VARIABLE_VALUE
196
NET_BUFFER_LENGTH 2048
197
set session net_buffer_length=8000;
198
show global variables like 'net_%';
200
net_buffer_length 1024
201
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
202
VARIABLE_NAME VARIABLE_VALUE
203
NET_BUFFER_LENGTH 1024
204
show session variables like 'net_%';
206
net_buffer_length 7168
207
select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
208
VARIABLE_NAME VARIABLE_VALUE
209
NET_BUFFER_LENGTH 7168
210
set net_buffer_length=1;
212
Error 1292 Truncated incorrect net_buffer_length value: '1'
213
show variables like 'net_buffer_length';
215
net_buffer_length 1024
216
select * from information_schema.session_variables where variable_name like 'net_buffer_length';
217
VARIABLE_NAME VARIABLE_VALUE
218
NET_BUFFER_LENGTH 1024
219
set net_buffer_length=2000000000;
221
Error 1292 Truncated incorrect net_buffer_length value: '2000000000'
222
show variables like 'net_buffer_length';
224
net_buffer_length 1048576
225
select * from information_schema.session_variables where variable_name like 'net_buffer_length';
226
VARIABLE_NAME VARIABLE_VALUE
227
NET_BUFFER_LENGTH 1048576
208
228
show variables like '%alloc%';
209
229
Variable_name Value
210
230
innodb_use_sys_malloc ON
211
231
query_alloc_block_size 8192
212
232
query_prealloc_size 8192
213
range_alloc_block_size 4096
214
select * from data_dictionary.session_variables where variable_name like '%alloc%';
233
range_alloc_block_size
234
transaction_alloc_block_size 8192
235
transaction_prealloc_size 4096
236
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
215
237
VARIABLE_NAME VARIABLE_VALUE
216
innodb_use_sys_malloc ON
217
query_alloc_block_size 8192
218
query_prealloc_size 8192
219
range_alloc_block_size 4096
238
INNODB_USE_SYS_MALLOC ON
239
QUERY_ALLOC_BLOCK_SIZE 8192
240
QUERY_PREALLOC_SIZE 8192
241
RANGE_ALLOC_BLOCK_SIZE
242
TRANSACTION_ALLOC_BLOCK_SIZE 8192
243
TRANSACTION_PREALLOC_SIZE 4096
220
244
set @@range_alloc_block_size=1024*16;
221
245
set @@query_alloc_block_size=1024*17+2;
222
246
set @@query_prealloc_size=1024*18;
247
set @@transaction_alloc_block_size=1024*20-1;
248
set @@transaction_prealloc_size=1024*21-1;
223
249
select @@query_alloc_block_size;
224
250
@@query_alloc_block_size
228
254
innodb_use_sys_malloc ON
229
255
query_alloc_block_size 17408
230
256
query_prealloc_size 18432
231
range_alloc_block_size 16384
232
select * from data_dictionary.session_variables where variable_name like '%alloc%';
257
range_alloc_block_size
258
transaction_alloc_block_size 19456
259
transaction_prealloc_size 20480
260
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
233
261
VARIABLE_NAME VARIABLE_VALUE
234
innodb_use_sys_malloc ON
235
query_alloc_block_size 17408
236
query_prealloc_size 18432
237
range_alloc_block_size 16384
262
INNODB_USE_SYS_MALLOC ON
263
QUERY_ALLOC_BLOCK_SIZE 17408
264
QUERY_PREALLOC_SIZE 18432
265
RANGE_ALLOC_BLOCK_SIZE
266
TRANSACTION_ALLOC_BLOCK_SIZE 19456
267
TRANSACTION_PREALLOC_SIZE 20480
238
268
set @@range_alloc_block_size=default;
239
269
set @@query_alloc_block_size=default, @@query_prealloc_size=default;
270
set transaction_alloc_block_size=default, @@transaction_prealloc_size=default;
240
271
show variables like '%alloc%';
241
272
Variable_name Value
242
273
innodb_use_sys_malloc ON
243
274
query_alloc_block_size 8192
244
275
query_prealloc_size 8192
245
range_alloc_block_size 4096
246
select * from data_dictionary.session_variables where variable_name like '%alloc%';
276
range_alloc_block_size
277
transaction_alloc_block_size 8192
278
transaction_prealloc_size 4096
279
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
247
280
VARIABLE_NAME VARIABLE_VALUE
248
innodb_use_sys_malloc ON
249
query_alloc_block_size 8192
250
query_prealloc_size 8192
251
range_alloc_block_size 4096
281
INNODB_USE_SYS_MALLOC ON
282
QUERY_ALLOC_BLOCK_SIZE 8192
283
QUERY_PREALLOC_SIZE 8192
284
RANGE_ALLOC_BLOCK_SIZE
285
TRANSACTION_ALLOC_BLOCK_SIZE 8192
286
TRANSACTION_PREALLOC_SIZE 4096
252
287
SELECT @@version LIKE 'non-existent';
253
288
@@version LIKE 'non-existent'
318
355
Error 1292 Truncated incorrect tmp_table_size value: '100'
319
356
set tx_isolation="READ-COMMITTED";
357
create temporary table t1 (a int not null auto_increment, primary key(a));
358
create temporary table t2 (a int not null auto_increment, primary key(a));
359
insert into t1 values(null),(null),(null);
360
insert into t2 values(null),(null),(null);
361
set global key_buffer_size=100000;
362
select @@key_buffer_size;
365
select * from t1 where a=2;
368
select * from t2 where a=3;
372
Table Op Msg_type Msg_text
373
test.t1 check status OK
374
test.t2 check status OK
375
select max(a) +1, max(a) +2 into @xx,@yy from t1;
378
ERROR HY000: Unknown system variable 'xxxxxxxxxx'
382
select @@session.key_buffer_size;
383
ERROR HY000: Variable 'key_buffer_size' is a GLOBAL variable
320
384
set global myisam_max_sort_file_size=4294967296;
321
385
show global variables like 'myisam_max_sort_file_size';
322
386
Variable_name Value
323
387
myisam_max_sort_file_size MAX_FILE_SIZE
324
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
388
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
325
389
VARIABLE_NAME VARIABLE_VALUE
326
myisam_max_sort_file_size MAX_FILE_SIZE
390
MYISAM_MAX_SORT_FILE_SIZE MAX_FILE_SIZE
327
391
set global myisam_max_sort_file_size=default;
392
set @@global.global.key_buffer_size= 1;
393
ERROR HY000: Unknown system variable 'global'
394
set GLOBAL global.key_buffer_size= 1;
395
ERROR HY000: Unknown system variable 'global'
396
SELECT @@global.global.key_buffer_size;
397
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'key_buffer_size' at line 1
398
SELECT @@global.session.key_buffer_size;
399
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'key_buffer_size' at line 1
400
SELECT @@global.local.key_buffer_size;
401
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'key_buffer_size' at line 1
328
402
create temporary table t1 (
532
618
set global flush_time =@my_flush_time;
533
619
ERROR HY000: Unknown system variable 'flush_time'
620
set global key_buffer_size =@my_key_buffer_size;
621
set global max_connect_errors =@my_max_connect_errors;
534
622
set global max_heap_table_size =@my_max_heap_table_size;
535
623
set global max_join_size =@my_max_join_size;
536
624
set global max_write_lock_count =default;
537
set global mysql_protocol_buffer_length= @my_mysql_protocol_buffer_length;
625
set global myisam_data_pointer_size =@my_myisam_data_pointer_size;
626
ERROR 42000: Incorrect argument type to variable 'myisam_data_pointer_size'
627
set global net_buffer_length =@my_net_buffer_length;
538
628
set global server_id =@my_server_id;
539
629
set global storage_engine =@my_storage_engine;
540
630
set global thread_cache_size =@my_thread_cache_size;
541
631
ERROR HY000: Unknown system variable 'thread_cache_size'
542
set global myisam_sort_buffer_size =@my_myisam_sort_buffer_size;
543
SHOW GLOBAL VARIABLES LIKE 'max_join_size';
545
max_join_size 2147483647
546
SHOW LOCAL VARIABLES LIKE 'max_join_size';
549
set GLOBAL bulk_insert_buffer_size=DEFAULT;
550
set GLOBAL join_buffer_size=DEFAULT;
551
set GLOBAL max_allowed_packet=DEFAULT;
552
set GLOBAL max_heap_table_size=DEFAULT;
553
set GLOBAL max_join_size=DEFAULT;
554
set GLOBAL max_sort_length=DEFAULT;
555
set GLOBAL max_write_lock_count=DEFAULT;
556
set GLOBAL myisam_sort_buffer_size=DEFAULT;
557
set GLOBAL mysql_protocol_buffer_length=DEFAULT;
558
set GLOBAL read_buffer_size=DEFAULT;
559
set GLOBAL read_rnd_buffer_size=DEFAULT;
560
set GLOBAL server_id=DEFAULT;
561
set GLOBAL sort_buffer_size=DEFAULT;
562
set GLOBAL table_open_cache=DEFAULT;
563
set GLOBAL storage_engine= @my_storage_engine;
564
set GLOBAL tmp_table_size=DEFAULT;
565
set GLOBAL tx_isolation= @my_tx_isolation;
566
set SESSION bulk_insert_buffer_size=DEFAULT;
567
set SESSION join_buffer_size=DEFAULT;
568
set SESSION max_allowed_packet=DEFAULT;
569
set SESSION max_heap_table_size=DEFAULT;
570
set SESSION max_join_size=DEFAULT;
571
set SESSION max_sort_length=DEFAULT;
572
set SESSION read_buffer_size=DEFAULT;
573
set SESSION read_rnd_buffer_size=DEFAULT;
574
set SESSION sort_buffer_size=DEFAULT;
575
set SESSION sql_big_selects=DEFAULT;
576
set SESSION sql_buffer_result=DEFAULT;
577
set SESSION sql_select_limit=DEFAULT;
578
set SESSION sql_warnings=DEFAULT;
579
set SESSION storage_engine= @my_storage_engine;
580
set SESSION tmp_table_size=DEFAULT;
581
set SESSION tx_isolation= @my_tx_isolation;
582
632
show global variables where variable_name='table_definition_cache' or Variable_name='table_lock_wait_timeout';
583
633
Variable_name Value
584
634
table_definition_cache #