set GLOBAL query_cache_size=1355776; flush query cache; flush query cache; reset query cache; flush status; drop table if exists t1,t2,t3,t4,t11,t21,t1_1,t1_2,t9,t9_1,t9_2; drop database if exists mysqltest; drop table if exists ```a`; drop view if exists v1; create table t1 (a int not null); insert into t1 values (1),(2),(3); select * from t1; a 1 2 3 select * from t1; a 1 2 3 select sql_no_cache * from t1; a 1 2 3 select length(now()) from t1; length(now()) 19 19 19 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 1 drop table t1; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 create table t1 (a int not null); insert into t1 values (1),(2),(3); create table t2 (a int not null); insert into t2 values (4),(5),(6); create table t3 (a int not null) engine=MERGE UNION=(t1,t2) INSERT_METHOD=FIRST; select * from t3; a 1 2 3 4 5 6 select * from t3; a 1 2 3 4 5 6 show status like "Qcache_hits"; Variable_name Value Qcache_hits 2 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 insert into t2 values (7); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t1; a 1 2 3 select * from t1; a 1 2 3 show status like "Qcache_hits"; Variable_name Value Qcache_hits 3 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 insert into t3 values (8); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t3; a 1 2 3 8 4 5 6 7 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 update t2 set a=9 where a=7; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t1; a 1 2 3 8 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 update t3 set a=10 where a=1; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t3; a 10 2 3 8 4 5 6 9 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 delete from t2 where a=9; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t1; a 10 2 3 8 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 delete from t3 where a=10; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 drop table t1, t2, t3; set query_cache_type=demand; create table t1 (a int not null); insert into t1 values (1),(2),(3); select * from t1; a 1 2 3 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select sql_cache * from t1 union select * from t1; a 1 2 3 set query_cache_type=2; select sql_cache * from t1 union select * from t1; a 1 2 3 select * from t1 union select sql_cache * from t1; a 1 2 3 show status like "Qcache_hits"; Variable_name Value Qcache_hits 4 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 set query_cache_type=on; reset query cache; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select sql_no_cache * from t1; a 1 2 3 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 drop table t1; create table t1 (a text not null); select CONNECTION_ID() from t1; CONNECTION_ID() select FOUND_ROWS(); FOUND_ROWS() 0 select NOW() from t1; NOW() select CURDATE() from t1; CURDATE() select CURTIME() from t1; CURTIME() select DATABASE() from t1; DATABASE() select ENCRYPT("test") from t1; ENCRYPT("test") select LAST_INSERT_ID() from t1; LAST_INSERT_ID() select RAND() from t1; RAND() select UNIX_TIMESTAMP() from t1; UNIX_TIMESTAMP() select USER() from t1; USER() select CURRENT_USER() from t1; CURRENT_USER() select benchmark(1,1) from t1; benchmark(1,1) explain extended select benchmark(1,1) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found Warnings: Note 1003 select benchmark(1,1) AS `benchmark(1,1)` from `test`.`t1` show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 create table t2 (a text not null); insert into t1 values("1111111111111111111111111111111111111111111111111111"); insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; show status like "Qcache_hits"; Variable_name Value Qcache_hits 4 show status like "Qcache_lowmem_prunes"; Variable_name Value Qcache_lowmem_prunes 0 select a as a1, a as a2 from t1; select a as a2, a as a3 from t1; select a as a3, a as a4 from t1; select a as a1, a as a2 from t1; show status like "Qcache_hits"; Variable_name Value Qcache_hits 4 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 show status like "Qcache_lowmem_prunes"; Variable_name Value Qcache_lowmem_prunes 2 reset query cache; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; insert into t2 select * from t1; insert into t1 select * from t2; select * from t1; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 drop table t1,t2; create database mysqltest; create table mysqltest.t1 (i int not null auto_increment, a int, primary key (i)); insert into mysqltest.t1 (a) values (1); select * from mysqltest.t1 where i is null; i a 1 1 create table t1(a int); select * from t1; a show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 select * from mysqltest.t1; i a 1 1 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 drop database mysqltest; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 drop table t1; create table t1 (a char(1) not null collate koi8r_general_ci); insert into t1 values(_koi8r"�"); set CHARACTER SET koi8r; select * from t1; a � set CHARACTER SET cp1251_koi8; select * from t1; a � set CHARACTER SET DEFAULT; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 show status like "Qcache_hits"; Variable_name Value Qcache_hits 4 drop table t1; create database if not exists mysqltest; create table mysqltest.t1 (i int not null); create table t1 (i int not null); insert into mysqltest.t1 (i) values (1); insert into t1 (i) values (2); select * from t1; i 2 use mysqltest; select * from t1; i 1 select * from t1; i 1 use test; select * from t1; i 2 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 drop database mysqltest; drop table t1; create table t1 (i int not null); insert into t1 (i) values (1),(2),(3),(4); select SQL_CALC_FOUND_ROWS * from t1 limit 2; i 1 2 select FOUND_ROWS(); FOUND_ROWS() 4 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 select * from t1 where i=1; i 1 select FOUND_ROWS(); FOUND_ROWS() 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 select SQL_CALC_FOUND_ROWS * from t1 limit 2; i 1 2 select FOUND_ROWS(); FOUND_ROWS() 4 show status like "Qcache_hits"; Variable_name Value Qcache_hits 7 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 select * from t1 where i=1; i 1 select FOUND_ROWS(); FOUND_ROWS() 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 8 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 drop table t1; flush query cache; reset query cache; create table t1 (a int not null); insert into t1 values (1),(2),(3); select * from t1; a 1 2 3 select * from t1; a 1 2 3 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 insert delayed into t1 values (4); select a from t1; a 1 2 3 4 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 drop table t1; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 show global variables like "query_cache_min_res_unit"; Variable_name Value query_cache_min_res_unit 4096 set GLOBAL query_cache_min_res_unit=1001; show global variables like "query_cache_min_res_unit"; Variable_name Value query_cache_min_res_unit 1008 create table t1 (a int not null); insert into t1 values (1),(2),(3); create table t2 (a int not null); insert into t2 values (1),(2),(3); select * from t1; a 1 2 3 select * from t1; a 1 2 3 select * from t2; a 1 2 3 select * from t2; a 1 2 3 show status like "Qcache_hits"; Variable_name Value Qcache_hits 11 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 drop table t1; select a from t2; a 1 2 3 select a from t2; a 1 2 3 show status like "Qcache_hits"; Variable_name Value Qcache_hits 12 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 drop table t2; set GLOBAL query_cache_min_res_unit=default; show global variables like "query_cache_min_res_unit"; Variable_name Value query_cache_min_res_unit 4096 create table t1 (a int not null); insert into t1 values (1); select "aaa" from t1; aaa aaa select "AAA" from t1; AAA AAA drop table t1; create table t1 (a int); set GLOBAL query_cache_size=1000; show global variables like "query_cache_size"; Variable_name Value query_cache_size 0 select * from t1; a set GLOBAL query_cache_size=1024; Warnings: Warning 1282 Query cache failed to set size 1024; new query cache size is 0 show global variables like "query_cache_size"; Variable_name Value query_cache_size 0 select * from t1; a set GLOBAL query_cache_size=10240; Warnings: Warning 1282 Query cache failed to set size 10240; new query cache size is 0 show global variables like "query_cache_size"; Variable_name Value query_cache_size 0 select * from t1; a set GLOBAL query_cache_size=20480; Warnings: Warning 1282 Query cache failed to set size 20480; new query cache size is 0 show global variables like "query_cache_size"; Variable_name Value query_cache_size 0 select * from t1; a set GLOBAL query_cache_size=40960; Warnings: Warning 1282 Query cache failed to set size 40960; new query cache size is 0 show global variables like "query_cache_size"; Variable_name Value query_cache_size 0 select * from t1; a set GLOBAL query_cache_size=51200; show global variables like "query_cache_size"; Variable_name Value query_cache_size 51200 select * from t1; a set GLOBAL query_cache_size=61440; show global variables like "query_cache_size"; Variable_name Value query_cache_size 61440 select * from t1; a set GLOBAL query_cache_size=81920; show global variables like "query_cache_size"; Variable_name Value query_cache_size 81920 select * from t1; a set GLOBAL query_cache_size=102400; show global variables like "query_cache_size"; Variable_name Value query_cache_size 102400 select * from t1; a drop table t1; set GLOBAL query_cache_size=1048576; create table t1 (i int not null); create table t2 (i int not null); select * from t1; i show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 create temporary table t3 (i int not null); select * from t2; i show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 select * from t3; i show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 update t1 set i=(select distinct 1 from (select * from t2) a); drop table t1, t2, t3; use mysql; select * from db; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 use test; select * from mysql.db; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 create table t1(id int auto_increment primary key); insert into t1 values (NULL), (NULL), (NULL); select * from t1 where id=2; id 2 alter table t1 rename to t2; select * from t1 where id=2; ERROR 42S02: Table 'test.t1' doesn't exist drop table t2; select * from t1 where id=2; ERROR 42S02: Table 'test.t1' doesn't exist create table t1 (word char(20) not null); select * from t1; word show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 load data infile 'TEST_DIR/std_data/words.dat' into table t1; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select count(*) from t1; count(*) 70 drop table t1; create table t1 (a int); insert into t1 values (1),(2),(3); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t1 into outfile "query_cache.out.file"; select * from t1 into outfile "query_cache.out.file"; ERROR HY000: File 'query_cache.out.file' already exists select * from t1 limit 1 into dumpfile "query_cache.dump.file"; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 drop table t1; create table t1 (a int); insert into t1 values (1),(2); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 select * from t1; a 1 2 SET OPTION SQL_SELECT_LIMIT=1; select * from t1; a 1 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 SET OPTION SQL_SELECT_LIMIT=DEFAULT; drop table t1; flush query cache; reset query cache; flush status; set GLOBAL query_cache_size=1048576; create table t1 (a int not null); insert into t1 values (1),(2),(3); create table t2 (a text not null); create table t3 (a text not null); insert into t3 values("1111111111111111111111111111111111111111111111111111"); insert into t2 select * from t3; insert into t3 select * from t2; insert into t2 select * from t3; insert into t3 select * from t2; insert into t2 select * from t3; insert into t3 select * from t2; insert into t2 select * from t3; insert into t3 select * from t2; insert into t2 select * from t3; insert into t3 select * from t2; drop table t2; create table t2 (a int not null); insert into t2 values (1),(2),(3); create table t4 (a int not null); insert into t4 values (1),(2),(3); select * from t4; select * from t2; select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2; select * from t2; select * from t4; select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2; select * from t2; select * from t4; select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2; delete from t2 where a=1; flush query cache; select * from t3; delete from t4 where a=1; flush query cache; drop table t1,t2,t3,t4; set query_cache_wlock_invalidate=1; create table t1 (a int not null); create table t2 (a int not null); select * from t1; a select * from t2; a show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 lock table t1 write, t2 read; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 unlock table; drop table t1,t2; set query_cache_wlock_invalidate=default; CREATE TABLE t1 (id INT PRIMARY KEY); insert into t1 values (1),(2),(3); select * from t1; id 1 2 3 create temporary table t1 (a int not null auto_increment primary key); select * from t1; a drop table t1; drop table t1; SET NAMES koi8r; CREATE TABLE t1 (a char(1) character set koi8r); INSERT INTO t1 VALUES (_koi8r'�'),(_koi8r'�'); SELECT a,'�','�'='�' FROM t1; a � '�'='�' � � 1 � � 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 set collation_connection=koi8r_bin; SELECT a,'�','�'='�' FROM t1; a � '�'='�' � � 0 � � 0 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 2 set character_set_client=cp1251; SELECT a,'�','�'='�' FROM t1; a � '�'='�' � � 0 � � 0 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 3 set character_set_results=cp1251; SELECT a,'�','�'='�' FROM t1; a � '�'='�' � � 0 � � 0 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 4 SET NAMES default; DROP TABLE t1; CREATE TABLE t1 (a int(1)); CREATE DATABASE mysqltest; USE mysqltest; DROP DATABASE mysqltest; SELECT * FROM test.t1; a USE test; DROP TABLE t1; set character_set_results=null; select @@character_set_results; @@character_set_results NULL set character_set_results=default; set GLOBAL query_cache_size=1355776; create table t1 (id int auto_increment primary key, c char(25)); insert into t1 set c = repeat('x',24); insert into t1 set c = concat(repeat('x',24),'x'); insert into t1 set c = concat(repeat('x',24),'w'); insert into t1 set c = concat(repeat('x',24),'y'); set max_sort_length=200; select c from t1 order by c, id; c xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxw xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxy reset query cache; set max_sort_length=20; select c from t1 order by c, id; c xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxw xxxxxxxxxxxxxxxxxxxxxxxxy set max_sort_length=200; select c from t1 order by c, id; c xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxw xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxy set max_sort_length=default; select '1' || '3' from t1; '1' || '3' 1 1 1 1 set SQL_MODE=oracle; select '1' || '3' from t1; '1' || '3' 13 13 13 13 set SQL_MODE=default; drop table t1; create table t1 (a varchar(20), b int); insert into t1 values ('12345678901234567890', 1); set group_concat_max_len=10; select group_concat(a) FROM t1 group by b; group_concat(a) 1234567890 Warnings: Warning 1260 1 line(s) were cut by GROUP_CONCAT() set group_concat_max_len=1024; select group_concat(a) FROM t1 group by b; group_concat(a) 12345678901234567890 set group_concat_max_len=default; drop table t1; create table t1 (a int); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 18 show status like "Qcache_hits"; Variable_name Value Qcache_hits 6 /**/ select * from t1; a /**/ select * from t1; a show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 19 show status like "Qcache_hits"; Variable_name Value Qcache_hits 7 DROP TABLE t1; SET GLOBAL query_cache_size=0; SET SESSION query_cache_type = 2; create table t1(a int); select table_name from information_schema.tables where table_schema="test"; table_name t1 drop table t1; select table_name from information_schema.tables where table_schema="test"; table_name SET SESSION query_cache_type = 1; set global query_cache_size=1024*1024; flush query cache; create table t1 ( a int ); insert into t1 values (1); select a from t1; a 1 select a from t1; a 1 show status like 'qcache_queries_in_cache'; Variable_name Value Qcache_queries_in_cache 1 repair table t1; Table Op Msg_type Msg_text test.t1 repair status OK show status like 'qcache_queries_in_cache'; Variable_name Value Qcache_queries_in_cache 0 drop table t1; set GLOBAL query_cache_size=64*1024; create table t1 (a text); insert into t1 values (repeat('abcdefghijklmnopqrstuvwxyz', 550)); create table t2 (a text); insert into t2 values (repeat('ijklmnopqrstuvwxyzabcdefgh', 550)); select a from t1; select a from t2; show status like 'Qcache_%_blocks'; Variable_name Value Qcache_free_blocks 1 Qcache_total_blocks 7 insert into t1 select reverse(a) from t1; show status like 'Qcache_%_blocks'; Variable_name Value Qcache_free_blocks 2 Qcache_total_blocks 5 select a from t1; show status like 'Qcache_%_blocks'; Variable_name Value Qcache_free_blocks 1 Qcache_total_blocks 8 select a from t1; a 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flush query cache; drop table t1, t2; set GLOBAL query_cache_size=1355776; #; flush status; CREATE TABLE t1 ( `date` datetime NOT NULL default '0000-00-00 00:00:00', KEY `date` (`date`) ) ENGINE=MyISAM; INSERT INTO t1 VALUES ('20050326'); INSERT INTO t1 VALUES ('20050325'); SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050327 invalid'; COUNT(*) 0 Warnings: Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1 Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1 SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050328 invalid'; COUNT(*) 0 Warnings: Warning 1292 Incorrect datetime value: '20050328 invalid' for column 'date' at row 1 Warning 1292 Incorrect datetime value: '20050328 invalid' for column 'date' at row 1 SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050327 invalid'; COUNT(*) 0 Warnings: Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1 Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 0 show status like "Qcache_hits"; Variable_name Value Qcache_hits 0 drop table t1; create table t1 (a int); insert into t1 values (1); reset query cache; flush status; select * from (select * from t1) a; a 1 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 0 select * from (select * from t1) a; a 1 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 1 insert into t1 values (2); show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 1 select * from (select * from t1) a; a 1 2 show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 2 show status like "Qcache_hits"; Variable_name Value Qcache_hits 1 drop table t1; create table t1 (a int); flush status; (select a from t1) union (select a from t1); a show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 0 (select a from t1) union (select a from t1); a show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 1 show status like "Qcache_inserts"; Variable_name Value Qcache_inserts 1 show status like "Qcache_hits"; Variable_name Value Qcache_hits 1 drop table t1; create table t1 (a int); insert into t1 values (1),(2); drop procedure if exists p1; CREATE PROCEDURE `p1`() begin Declare c1 cursor for select a from t1; open c1; select * from t1; end// call p1()// a 1 2 drop procedure p1; create function f1() returns int begin Declare var1 int; select max(a) from t1 into var1; return var1; end// create procedure `p1`() begin select a, f1() from t1; end// call p1()// a f1() 1 2 2 2 drop procedure p1// drop function f1// drop table t1// flush query cache; reset query cache; flush status; create table t1 (s1 int)// create procedure f1 () begin select sql_cache * from t1; select sql_cache * from t1; select sql_cache * from t1; end;// create procedure f2 () begin select sql_cache * from t1 where s1=1; select sql_cache * from t1; end;// create procedure f3 () begin select sql_cache * from t1; select sql_cache * from t1 where s1=1; end;// create procedure f4 () begin select sql_cache * from t1; select sql_cache * from t1 where s1=1; select sql_cache * from t1; select sql_cache * from t1 where s1=1; select sql_cache * from t1 where s1=1; end;// call f1(); s1 s1 s1 call f1(); s1 s1 s1 call f1(); s1 s1 s1 select sql_cache * from t1; s1 insert into t1 values (1); select sql_cache * from t1; s1 1 call f1(); s1 1 s1 1 s1 1 call f1(); s1 1 s1 1 s1 1 select sql_cache * from t1; s1 1 flush query cache; reset query cache; flush status; select sql_cache * from t1; s1 1 select sql_cache * from t1 where s1=1; s1 1 call f1(); s1 1 s1 1 s1 1 call f2(); s1 1 s1 1 call f3(); s1 1 s1 1 call f4(); s1 1 s1 1 s1 1 s1 1 s1 1 call f4(); s1 1 s1 1 s1 1 s1 1 s1 1 call f3(); s1 1 s1 1 call f2(); s1 1 s1 1 select sql_cache * from t1 where s1=1; s1 1 insert into t1 values (2); call f1(); s1 1 2 s1 1 2 s1 1 2 select sql_cache * from t1 where s1=1; s1 1 select sql_cache * from t1; s1 1 2 call f1(); s1 1 2 s1 1 2 s1 1 2 call f3(); s1 1 2 s1 1 call f3(); s1 1 2 s1 1 call f1(); s1 1 2 s1 1 2 s1 1 2 drop procedure f1; drop procedure f2; drop procedure f3; drop procedure f4; drop table t1; set GLOBAL query_cache_size=0; SET GLOBAL query_cache_size=102400; create table t1(a int); insert into t1 values(0), (1), (4), (5); select * from t1 where a > 3; a 4 5 select * from t1 where a > 3; a 4 5 show status like 'last_query_cost'; Variable_name Value Last_query_cost 0.000000 drop table t1; SET GLOBAL query_cache_size=0;