Edit File: key_cache.result
drop table if exists t1, t2, t3; SET @save_key_buffer=@@key_buffer_size; SELECT @@key_buffer_size, @@small.key_buffer_size; @@key_buffer_size @@small.key_buffer_size 2097152 131072 SET @@global.key_buffer_size=16*1024*1024; SET @@global.default.key_buffer_size=16*1024*1024; SET @@global.default.key_buffer_size=16*1024*1024; SET @@global.small.key_buffer_size=1*1024*1024; SET @@global.medium.key_buffer_size=4*1024*1024; SET @@global.medium.key_buffer_size=0; SET @@global.medium.key_buffer_size=0; SHOW VARIABLES like "key_buffer_size"; Variable_name Value key_buffer_size 16777216 SELECT @@key_buffer_size; @@key_buffer_size 16777216 SELECT @@global.key_buffer_size; @@global.key_buffer_size 16777216 SELECT @@global.default.key_buffer_size; @@global.default.key_buffer_size 16777216 SELECT @@global.default.`key_buffer_size`; @@global.default.`key_buffer_size` 16777216 SELECT @@global.`default`.`key_buffer_size`; @@global.`default`.`key_buffer_size` 16777216 SELECT @@`default`.key_buffer_size; @@`default`.key_buffer_size 16777216 SELECT @@small.key_buffer_size; @@small.key_buffer_size 1048576 SELECT @@medium.key_buffer_size; @@medium.key_buffer_size 0 SET @@global.key_buffer_size=@save_key_buffer; SELECT @@default.key_buffer_size; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'default.key_buffer_size' at line 1 SELECT @@skr.storage_engine="test"; ERROR HY000: Variable 'storage_engine' is not a variable component (can't be used as XXXX.variable_name) select @@keycache1.key_cache_block_size; @@keycache1.key_cache_block_size 0 select @@keycache1.key_buffer_size; @@keycache1.key_buffer_size 0 set global keycache1.key_cache_block_size=2048; select @@keycache1.key_buffer_size; @@keycache1.key_buffer_size 0 select @@keycache1.key_cache_block_size; @@keycache1.key_cache_block_size 2048 set global keycache1.key_buffer_size=1*1024*1024; select @@keycache1.key_buffer_size; @@keycache1.key_buffer_size 1048576 select @@keycache1.key_cache_block_size; @@keycache1.key_cache_block_size 2048 set global keycache2.key_buffer_size=4*1024*1024; select @@keycache2.key_buffer_size; @@keycache2.key_buffer_size 4194304 select @@keycache2.key_cache_block_size; @@keycache2.key_cache_block_size 1024 set global keycache1.key_buffer_size=0; select @@keycache1.key_buffer_size; @@keycache1.key_buffer_size 0 select @@keycache1.key_cache_block_size; @@keycache1.key_cache_block_size 2048 select @@key_buffer_size; @@key_buffer_size 2097152 select @@key_cache_block_size; @@key_cache_block_size 1024 set global keycache1.key_buffer_size=1024*1024; create table t1 (p int primary key, a char(10)) delay_key_write=1; create table t2 (p int primary key, i int, a char(10), key k1(i), key k2(a)); show status like 'key_blocks_used'; Variable_name Value Key_blocks_used 0 show status like 'key_blocks_unused'; Variable_name Value Key_blocks_unused KEY_BLOCKS_UNUSED insert into t1 values (1, 'qqqq'), (11, 'yyyy'); insert into t2 values (1, 1, 'qqqq'), (2, 1, 'pppp'), (3, 1, 'yyyy'), (4, 3, 'zzzz'); select * from t1; p a 1 qqqq 11 yyyy select * from t2; p i a 1 1 qqqq 2 1 pppp 3 1 yyyy 4 3 zzzz update t1 set p=2 where p=1; update t2 set i=2 where i=1; show status like 'key_blocks_used'; Variable_name Value Key_blocks_used 4 show status like 'key_blocks_unused'; Variable_name Value Key_blocks_unused KEY_BLOCKS_UNUSED cache index t1 key (`primary`) in keycache1; Table Op Msg_type Msg_text test.t1 assign_to_keycache status OK explain select p from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL PRIMARY 4 NULL 2 Using index select p from t1; p 2 11 explain select i from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL k1 5 NULL 4 Using index select i from t2; i 2 2 2 3 explain select count(*) from t1, t2 where t1.p = t2.i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 2 Using index 1 SIMPLE t2 ref k1 k1 5 test.t1.p 2 Using index select count(*) from t1, t2 where t1.p = t2.i; count(*) 3 cache index t2 in keycache1; Table Op Msg_type Msg_text test.t2 assign_to_keycache status OK update t2 set p=p+1000, i=2 where a='qqqq'; cache index t2 in keycache2; Table Op Msg_type Msg_text test.t2 assign_to_keycache status OK insert into t2 values (2000, 3, 'yyyy'); cache index t2 in keycache1; Table Op Msg_type Msg_text test.t2 assign_to_keycache status OK update t2 set p=3000 where a='zzzz'; select * from t2; p i a 1001 2 qqqq 2 2 pppp 3 2 yyyy 3000 3 zzzz 2000 3 yyyy explain select p from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL PRIMARY 4 NULL 5 Using index select p from t2; p 2 3 1001 2000 3000 explain select i from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL k1 5 NULL 5 Using index select i from t2; i 2 2 2 3 3 explain select a from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL k2 11 NULL 5 Using index select a from t2; a pppp qqqq yyyy yyyy zzzz cache index t1 in unknown_key_cache; ERROR HY000: Unknown key cache 'unknown_key_cache' cache index t1 key (unknown_key) in keycache1; Table Op Msg_type Msg_text test.t1 assign_to_keycache Error Key 'unknown_key' doesn't exist in table 't1' test.t1 assign_to_keycache status Operation failed select @@keycache2.key_buffer_size; @@keycache2.key_buffer_size 4194304 select @@keycache2.key_cache_block_size; @@keycache2.key_cache_block_size 1024 set global keycache2.key_buffer_size=0; select @@keycache2.key_buffer_size; @@keycache2.key_buffer_size 0 select @@keycache2.key_cache_block_size; @@keycache2.key_cache_block_size 1024 set global keycache2.key_buffer_size=1024*1024; select @@keycache2.key_buffer_size; @@keycache2.key_buffer_size 1048576 update t2 set p=4000 where a='zzzz'; update t1 set p=p+1; set global keycache1.key_buffer_size=0; select * from t2; p i a 1001 2 qqqq 2 2 pppp 3 2 yyyy 4000 3 zzzz 2000 3 yyyy select p from t2; p 2 3 1001 2000 4000 explain select i from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL k1 5 NULL 5 Using index select i from t2; i 2 2 2 3 3 explain select a from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL k2 11 NULL 5 Using index select a from t2; a pppp qqqq yyyy yyyy zzzz select * from t1; p a 3 qqqq 12 yyyy select p from t1; p 3 12 create table t3 (like t1); cache index t3 in small; Table Op Msg_type Msg_text test.t3 assign_to_keycache status OK insert into t3 select * from t1; cache index t3 in keycache2; Table Op Msg_type Msg_text test.t3 assign_to_keycache status OK cache index t1,t2 in default; Table Op Msg_type Msg_text test.t1 assign_to_keycache status OK test.t2 assign_to_keycache status OK drop table t1,t2,t3; show status like 'key_blocks_used'; Variable_name Value Key_blocks_used 4 show status like 'key_blocks_unused'; Variable_name Value Key_blocks_unused KEY_BLOCKS_UNUSED create table t1 (a int primary key); cache index t1 in keycache2; Table Op Msg_type Msg_text test.t1 assign_to_keycache status OK insert t1 values (1),(2),(3),(4),(5),(6),(7),(8); set global keycache2.key_buffer_size=0; select * from t1; a 1 2 3 4 5 6 7 8 drop table t1; set global keycache3.key_buffer_size=100; Warnings: Warning 1292 Truncated incorrect key_buffer_size value: '100' set global keycache3.key_buffer_size=0; create table t1 (mytext text, FULLTEXT (mytext)); insert t1 values ('aaabbb'); check table t1; Table Op Msg_type Msg_text test.t1 check status OK set @my_key_cache_block_size= @@global.key_cache_block_size; set GLOBAL key_cache_block_size=2048; check table t1; Table Op Msg_type Msg_text test.t1 check status OK drop table t1; set global key_cache_block_size= @my_key_cache_block_size; CREATE TABLE t1(a int NOT NULL AUTO_INCREMENT PRIMARY KEY); SET @my_key_cache_block_size= @@global.key_cache_block_size; SET GLOBAL key_cache_block_size=1536; INSERT INTO t1 VALUES (1); SELECT @@key_cache_block_size; @@key_cache_block_size 1536 CHECK TABLE t1; Table Op Msg_type Msg_text test.t1 check status OK DROP TABLE t1; CREATE TABLE t1(a int NOT NULL AUTO_INCREMENT PRIMARY KEY, b int); CREATE TABLE t2(a int NOT NULL AUTO_INCREMENT PRIMARY KEY, b int); SET GLOBAL key_cache_block_size=1536; INSERT INTO t1 VALUES (1,0); INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; INSERT INTO t2(b) SELECT b FROM t1; INSERT INTO t1(b) SELECT b FROM t2; SELECT COUNT(*) FROM t1; COUNT(*) 4181 SELECT @@key_cache_block_size; @@key_cache_block_size 1536 CHECK TABLE t1; Table Op Msg_type Msg_text test.t1 check status OK DROP TABLE t1,t2; set global key_cache_block_size= @my_key_cache_block_size; set @@global.key_buffer_size=0; ERROR HY000: Cannot drop default keycache select @@global.key_buffer_size; @@global.key_buffer_size 2097152 SET @bug28478_key_cache_block_size= @@global.key_cache_block_size; SET GLOBAL key_cache_block_size= 1536; CREATE TABLE t1 ( id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, c1 CHAR(150), c2 CHAR(150), c3 CHAR(150), KEY(c1, c2, c3) ) ENGINE= MyISAM; INSERT INTO t1 (c1, c2, c3) VALUES ('a', 'b', 'c'), ('b', 'c', 'd'), ('c', 'd', 'e'), ('d', 'e', 'f'), ('e', 'f', 'g'), ('f', 'g', 'h'), ('g', 'h', 'i'), ('h', 'i', 'j'), ('i', 'j', 'k'), ('j', 'k', 'l'), ('k', 'l', 'm'), ('l', 'm', 'n'), ('m', 'n', 'o'), ('n', 'o', 'p'), ('o', 'p', 'q'), ('p', 'q', 'r'), ('q', 'r', 's'), ('r', 's', 't'), ('s', 't', 'u'), ('t', 'u', 'v'), ('u', 'v', 'w'), ('v', 'w', 'x'), ('w', 'x', 'y'), ('x', 'y', 'z'); INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1; INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1; INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1; CHECK TABLE t1; Table Op Msg_type Msg_text test.t1 check status OK SHOW VARIABLES LIKE 'key_cache_block_size'; Variable_name Value key_cache_block_size 1536 SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size; DROP TABLE t1; # # Bug#12361113: crash when load index into cache # # Note that this creates an empty disabled key cache! SET GLOBAL key_cache_none.key_cache_block_size = 1024; CREATE TABLE t1 (a INT, b INTEGER NOT NULL, KEY (b) ) ENGINE = MYISAM; INSERT INTO t1 VALUES (1, 1); CACHE INDEX t1 in key_cache_none; ERROR HY000: Unknown key cache 'key_cache_none' # The bug crashed the server at LOAD INDEX below. Now it will succeed # since the default cache is used due to CACHE INDEX failed for # key_cache_none. LOAD INDEX INTO CACHE t1; Table Op Msg_type Msg_text test.t1 preload_keys status OK DROP TABLE t1;