83
84
show variables like 'max_join_size';
84
85
Variable_name Value
86
select * from data_dictionary.session_variables where variable_name like 'max_join_size';
87
select * from information_schema.session_variables where variable_name like 'max_join_size';
87
88
VARIABLE_NAME VARIABLE_VALUE
89
90
show global variables like 'max_join_size';
90
91
Variable_name Value
92
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
93
select * from information_schema.global_variables where variable_name like 'max_join_size';
93
94
VARIABLE_NAME VARIABLE_VALUE
95
96
set GLOBAL max_join_size=2000;
96
97
show global variables like 'max_join_size';
97
98
Variable_name Value
99
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
100
select * from information_schema.global_variables where variable_name like 'max_join_size';
100
101
VARIABLE_NAME VARIABLE_VALUE
102
103
set max_join_size=DEFAULT;
103
104
show variables like 'max_join_size';
104
105
Variable_name Value
105
106
max_join_size 2000
106
select * from data_dictionary.session_variables where variable_name like 'max_join_size';
107
select * from information_schema.session_variables where variable_name like 'max_join_size';
107
108
VARIABLE_NAME VARIABLE_VALUE
109
110
set GLOBAL max_join_size=DEFAULT;
110
111
show global variables like 'max_join_size';
111
112
Variable_name Value
112
113
max_join_size 2147483647
113
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
114
select * from information_schema.global_variables where variable_name like 'max_join_size';
114
115
VARIABLE_NAME VARIABLE_VALUE
115
max_join_size 2147483647
116
MAX_JOIN_SIZE 2147483647
116
117
set @@max_join_size=1000, @@global.max_join_size=2000;
117
118
select @@local.max_join_size, @@global.max_join_size;
118
119
@@local.max_join_size @@global.max_join_size
143
144
show variables like 'timed_mutexes';
144
145
Variable_name Value
146
select * from data_dictionary.session_variables where variable_name like 'timed_mutexes';
147
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
147
148
VARIABLE_NAME VARIABLE_VALUE
149
150
set global timed_mutexes=0;
150
151
show variables like 'timed_mutexes';
151
152
Variable_name Value
152
153
timed_mutexes OFF
153
select * from data_dictionary.session_variables where variable_name like 'timed_mutexes';
154
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
154
155
VARIABLE_NAME VARIABLE_VALUE
156
set storage_engine=MYISAM, storage_engine="MEMORY";
157
set storage_engine=MYISAM, storage_engine="HEAP";
157
158
show local variables like 'storage_engine';
158
159
Variable_name Value
159
160
storage_engine MEMORY
160
select * from data_dictionary.session_variables where variable_name like 'storage_engine';
161
select * from information_schema.session_variables where variable_name like 'storage_engine';
161
162
VARIABLE_NAME VARIABLE_VALUE
162
storage_engine MEMORY
163
STORAGE_ENGINE MEMORY
163
164
show global variables like 'storage_engine';
164
165
Variable_name Value
165
166
storage_engine InnoDB
166
select * from data_dictionary.global_variables where variable_name like 'storage_engine';
167
select * from information_schema.global_variables where variable_name like 'storage_engine';
167
168
VARIABLE_NAME VARIABLE_VALUE
168
storage_engine InnoDB
169
STORAGE_ENGINE InnoDB
169
170
set GLOBAL myisam_max_sort_file_size=2000000;
170
171
show global variables like 'myisam_max_sort_file_size';
171
172
Variable_name Value
172
173
myisam_max_sort_file_size 2000000
173
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
174
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
174
175
VARIABLE_NAME VARIABLE_VALUE
175
myisam_max_sort_file_size 2000000
176
MYISAM_MAX_SORT_FILE_SIZE 2000000
176
177
set GLOBAL myisam_max_sort_file_size=default;
177
178
show global variables like 'myisam_max_sort_file_size';
178
179
Variable_name Value
179
180
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
181
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
182
VARIABLE_NAME VARIABLE_VALUE
183
MYISAM_MAX_SORT_FILE_SIZE 2147483647
184
set global net_buffer_length=1024;
185
set session net_buffer_length=2048;
186
show global variables like 'net_%';
188
net_buffer_length 1024
189
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
190
VARIABLE_NAME VARIABLE_VALUE
191
NET_BUFFER_LENGTH 1024
192
show session variables like 'net_%';
194
net_buffer_length 2048
195
select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
196
VARIABLE_NAME VARIABLE_VALUE
197
NET_BUFFER_LENGTH 2048
198
set session net_buffer_length=8000;
199
show global variables like 'net_%';
201
net_buffer_length 1024
202
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
203
VARIABLE_NAME VARIABLE_VALUE
204
NET_BUFFER_LENGTH 1024
205
show session variables like 'net_%';
207
net_buffer_length 7168
208
select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
209
VARIABLE_NAME VARIABLE_VALUE
210
NET_BUFFER_LENGTH 7168
211
set net_buffer_length=1;
213
Error 1292 Truncated incorrect net_buffer_length value: '1'
214
show variables like 'net_buffer_length';
216
net_buffer_length 1024
217
select * from information_schema.session_variables where variable_name like 'net_buffer_length';
218
VARIABLE_NAME VARIABLE_VALUE
219
NET_BUFFER_LENGTH 1024
220
set net_buffer_length=2000000000;
222
Error 1292 Truncated incorrect net_buffer_length value: '2000000000'
223
show variables like 'net_buffer_length';
225
net_buffer_length 1048576
226
select * from information_schema.session_variables where variable_name like 'net_buffer_length';
227
VARIABLE_NAME VARIABLE_VALUE
228
NET_BUFFER_LENGTH 1048576
208
229
show variables like '%alloc%';
209
230
Variable_name Value
210
231
innodb_use_sys_malloc ON
211
232
query_alloc_block_size 8192
212
233
query_prealloc_size 8192
213
range_alloc_block_size 4096
214
select * from data_dictionary.session_variables where variable_name like '%alloc%';
234
range_alloc_block_size
235
transaction_alloc_block_size 8192
236
transaction_prealloc_size 4096
237
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
215
238
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
239
INNODB_USE_SYS_MALLOC ON
240
QUERY_ALLOC_BLOCK_SIZE 8192
241
QUERY_PREALLOC_SIZE 8192
242
RANGE_ALLOC_BLOCK_SIZE
243
TRANSACTION_ALLOC_BLOCK_SIZE 8192
244
TRANSACTION_PREALLOC_SIZE 4096
220
245
set @@range_alloc_block_size=1024*16;
221
246
set @@query_alloc_block_size=1024*17+2;
222
247
set @@query_prealloc_size=1024*18;
248
set @@transaction_alloc_block_size=1024*20-1;
249
set @@transaction_prealloc_size=1024*21-1;
223
250
select @@query_alloc_block_size;
224
251
@@query_alloc_block_size
228
255
innodb_use_sys_malloc ON
229
256
query_alloc_block_size 17408
230
257
query_prealloc_size 18432
231
range_alloc_block_size 16384
232
select * from data_dictionary.session_variables where variable_name like '%alloc%';
258
range_alloc_block_size
259
transaction_alloc_block_size 19456
260
transaction_prealloc_size 20480
261
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
233
262
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
263
INNODB_USE_SYS_MALLOC ON
264
QUERY_ALLOC_BLOCK_SIZE 17408
265
QUERY_PREALLOC_SIZE 18432
266
RANGE_ALLOC_BLOCK_SIZE
267
TRANSACTION_ALLOC_BLOCK_SIZE 19456
268
TRANSACTION_PREALLOC_SIZE 20480
238
269
set @@range_alloc_block_size=default;
239
270
set @@query_alloc_block_size=default, @@query_prealloc_size=default;
271
set transaction_alloc_block_size=default, @@transaction_prealloc_size=default;
240
272
show variables like '%alloc%';
241
273
Variable_name Value
242
274
innodb_use_sys_malloc ON
243
275
query_alloc_block_size 8192
244
276
query_prealloc_size 8192
245
range_alloc_block_size 4096
246
select * from data_dictionary.session_variables where variable_name like '%alloc%';
277
range_alloc_block_size
278
transaction_alloc_block_size 8192
279
transaction_prealloc_size 4096
280
select * from information_schema.session_variables where variable_name like '%alloc%' order by 1;
247
281
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
282
INNODB_USE_SYS_MALLOC ON
283
QUERY_ALLOC_BLOCK_SIZE 8192
284
QUERY_PREALLOC_SIZE 8192
285
RANGE_ALLOC_BLOCK_SIZE
286
TRANSACTION_ALLOC_BLOCK_SIZE 8192
287
TRANSACTION_PREALLOC_SIZE 4096
252
288
SELECT @@version LIKE 'non-existent';
253
289
@@version LIKE 'non-existent'
318
356
Error 1292 Truncated incorrect tmp_table_size value: '100'
319
357
set tx_isolation="READ-COMMITTED";
358
create temporary table t1 (a int not null auto_increment, primary key(a));
359
create temporary table t2 (a int not null auto_increment, primary key(a));
360
insert into t1 values(null),(null),(null);
361
insert into t2 values(null),(null),(null);
362
set global key_buffer_size=100000;
363
select @@key_buffer_size;
366
select * from t1 where a=2;
369
select * from t2 where a=3;
373
Table Op Msg_type Msg_text
374
test.t1 check status OK
375
test.t2 check status OK
376
select max(a) +1, max(a) +2 into @xx,@yy from t1;
379
ERROR HY000: Unknown system variable 'xxxxxxxxxx'
383
select @@session.key_buffer_size;
384
ERROR HY000: Variable 'key_buffer_size' is a GLOBAL variable
320
385
set global myisam_max_sort_file_size=4294967296;
321
386
show global variables like 'myisam_max_sort_file_size';
322
387
Variable_name Value
323
388
myisam_max_sort_file_size MAX_FILE_SIZE
324
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
389
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
325
390
VARIABLE_NAME VARIABLE_VALUE
326
myisam_max_sort_file_size MAX_FILE_SIZE
391
MYISAM_MAX_SORT_FILE_SIZE MAX_FILE_SIZE
327
392
set global myisam_max_sort_file_size=default;
393
set @@global.global.key_buffer_size= 1;
394
ERROR HY000: Unknown system variable 'global'
395
set GLOBAL global.key_buffer_size= 1;
396
ERROR HY000: Unknown system variable 'global'
397
SELECT @@global.global.key_buffer_size;
398
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
399
SELECT @@global.session.key_buffer_size;
400
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
401
SELECT @@global.local.key_buffer_size;
402
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
403
create temporary table t1 (
532
619
set global flush_time =@my_flush_time;
533
620
ERROR HY000: Unknown system variable 'flush_time'
621
set global myisam_sort_buffer_size =@my_myisam_sort_buffer_size;
622
set global key_buffer_size =@my_key_buffer_size;
623
set global max_connect_errors =@my_max_connect_errors;
534
624
set global max_heap_table_size =@my_max_heap_table_size;
535
625
set global max_join_size =@my_max_join_size;
536
626
set global max_write_lock_count =default;
537
set global mysql_protocol_buffer_length= @my_mysql_protocol_buffer_length;
627
set global myisam_data_pointer_size =@my_myisam_data_pointer_size;
628
ERROR 42000: Incorrect argument type to variable 'myisam_data_pointer_size'
629
set global net_buffer_length =@my_net_buffer_length;
538
630
set global server_id =@my_server_id;
539
631
set global storage_engine =@my_storage_engine;
540
632
set global thread_cache_size =@my_thread_cache_size;
541
633
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
634
show global variables where variable_name='table_definition_cache' or Variable_name='table_lock_wait_timeout';
583
635
Variable_name Value
584
636
table_definition_cache #