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2dcf451b81
Moved the key statistics update to info(). The table is not locked in open(). This made wrong stats possible. No test case for the test suite. This happens only with heavy concurrency. A test script is added to the bug report.
369 lines
13 KiB
Plaintext
369 lines
13 KiB
Plaintext
drop table if exists t1,t2;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps" avg_row_length=100 min_rows=1 max_rows=100;
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a=1 or a=0;
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 a NULL 3 NULL NULL HASH
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select * from t1;
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a b
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2 2
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3 3
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4 4
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select * from t1 where a=4;
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a b
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4 4
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update t1 set b=5 where a=4;
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update t1 set b=b+1 where a>=3;
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replace t1 values (3,3);
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select * from t1;
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a b
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2 2
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3 3
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4 6
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alter table t1 add c int not null, add key using HASH (c,a);
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drop table t1;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps";
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a > 0;
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select * from t1;
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a b
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drop table t1;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps";
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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alter table t1 modify a int not null auto_increment, engine=myisam, comment="new myisam table";
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select * from t1;
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a b
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1 1
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2 2
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3 3
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4 4
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drop table t1;
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create table t1 (a int not null) engine=heap;
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insert into t1 values (869751),(736494),(226312),(802616);
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select * from t1 where a > 736494;
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a
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869751
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802616
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alter table t1 add unique uniq_id using HASH (a);
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select * from t1 where a > 736494;
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a
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869751
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802616
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select * from t1 where a = 736494;
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a
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736494
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select * from t1 where a=869751 or a=736494;
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a
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736494
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869751
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select * from t1 where a in (869751,736494,226312,802616);
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a
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226312
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736494
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802616
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869751
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alter table t1 engine=myisam;
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explain select * from t1 where a in (869751,736494,226312,802616);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 Using where; Using index
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drop table t1;
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create table t1 (x int not null, y int not null, key x using HASH (x), unique y using HASH (y))
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engine=heap;
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insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);
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select * from t1 where x=1;
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x y
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1 3
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1 1
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select * from t1,t1 as t2 where t1.x=t2.y;
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x y x y
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1 1 1 1
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2 2 2 2
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1 3 1 1
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2 4 2 2
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2 5 2 2
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2 6 2 2
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explain select * from t1,t1 as t2 where t1.x=t2.y;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL x NULL NULL NULL 6
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1 SIMPLE t2 eq_ref y y 4 test.t1.x 1
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drop table t1;
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create table t1 (a int) engine=heap;
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insert into t1 values(1);
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select max(a) from t1;
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max(a)
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1
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drop table t1;
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CREATE TABLE t1 ( a int not null default 0, b int not null default 0, key using HASH (a), key using HASH (b) ) ENGINE=HEAP;
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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drop table t1;
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create table t1 (id int unsigned not null, primary key using HASH (id)) engine=HEAP;
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insert into t1 values(1);
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select max(id) from t1;
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max(id)
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1
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insert into t1 values(2);
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select max(id) from t1;
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max(id)
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2
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replace into t1 values(1);
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drop table t1;
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create table t1 (n int) engine=heap;
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drop table t1;
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create table t1 (n int) engine=heap;
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drop table if exists t1;
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CREATE table t1(f1 int not null,f2 char(20) not
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null,index(f2)) engine=heap;
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INSERT into t1 set f1=12,f2="bill";
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INSERT into t1 set f1=13,f2="bill";
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INSERT into t1 set f1=14,f2="bill";
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INSERT into t1 set f1=15,f2="bill";
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INSERT into t1 set f1=16,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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delete from t1 where f2="bill";
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select * from t1;
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f1 f2
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16 ted
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12 ted
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12 ted
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12 ted
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12 ted
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drop table t1;
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create table t1 (btn char(10) not null, key using HASH (btn)) engine=heap;
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insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
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explain select * from t1 where btn like "q%";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL btn NULL NULL NULL 14 Using where
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select * from t1 where btn like "q%";
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btn
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alter table t1 add column new_col char(1) not null, add key using HASH (btn,new_col), drop key btn;
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update t1 set new_col=left(btn,1);
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explain select * from t1 where btn="a";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL btn NULL NULL NULL 11 Using where
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explain select * from t1 where btn="a" and new_col="a";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref btn btn 11 const,const 2 Using where
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drop table t1;
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CREATE TABLE t1 (
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a int default NULL,
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b int default NULL,
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KEY a using HASH (a),
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UNIQUE b using HASH (b)
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) engine=heap;
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INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
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SELECT * FROM t1 WHERE a=NULL;
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a b
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explain SELECT * FROM t1 WHERE a IS NULL;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 5 const 1 Using where
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SELECT * FROM t1 WHERE a<=>NULL;
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a b
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NULL 99
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SELECT * FROM t1 WHERE b=NULL;
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a b
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explain SELECT * FROM t1 WHERE b IS NULL;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref b b 5 const 1 Using where
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SELECT * FROM t1 WHERE b<=>NULL;
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a b
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99 NULL
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INSERT INTO t1 VALUES (1,3);
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ERROR 23000: Duplicate entry '3' for key 1
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DROP TABLE t1;
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CREATE TABLE t1 (a int not null, primary key using HASH (a)) engine=heap;
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INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
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DELETE from t1 where a < 100;
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SELECT * from t1;
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a
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DROP TABLE t1;
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create table t1
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(
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a char(8) not null,
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b char(20) not null,
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c int not null,
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key (a)
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) engine=heap;
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insert into t1 values ('aaaa', 'prefill-hash=5',0);
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insert into t1 values ('aaab', 'prefill-hash=0',0);
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insert into t1 values ('aaac', 'prefill-hash=7',0);
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insert into t1 values ('aaad', 'prefill-hash=2',0);
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insert into t1 values ('aaae', 'prefill-hash=1',0);
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insert into t1 values ('aaaf', 'prefill-hash=4',0);
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insert into t1 values ('aaag', 'prefill-hash=3',0);
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insert into t1 values ('aaah', 'prefill-hash=6',0);
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 1 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 1 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 1 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 1 Using where
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insert into t1 select * from t1;
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flush tables;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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flush tables;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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create table t2 as select * from t1;
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delete from t1;
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insert into t1 select * from t2;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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drop table t1, t2;
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create table t1 (
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id int unsigned not null primary key auto_increment,
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name varchar(20) not null,
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index heap_idx(name),
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index btree_idx using btree(name)
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) engine=heap;
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create table t2 (
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id int unsigned not null primary key auto_increment,
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name varchar(20) not null,
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index btree_idx using btree(name),
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index heap_idx(name)
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) engine=heap;
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insert into t1 (name) values ('Matt'), ('Lilu'), ('Corbin'), ('Carly'),
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('Suzy'), ('Hoppy'), ('Burrito'), ('Mimi'), ('Sherry'), ('Ben'), ('Phil'),
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('Emily'), ('Mike');
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insert into t2 select * from t1;
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explain select * from t1 where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx heap_idx 20 const 1 Using where
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explain select * from t2 where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 20 const 1 Using where
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explain select * from t1 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx heap_idx 20 const 1 Using where
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explain select * from t2 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 20 const 1 Using where
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explain select * from t1 where name='Phil';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx heap_idx 20 const 1 Using where
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explain select * from t2 where name='Phil';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 20 const 1 Using where
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explain select * from t1 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx heap_idx 20 const 1 Using where
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explain select * from t2 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 20 const 1 Using where
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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flush tables;
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select count(*) from t1 where name='Matt';
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count(*)
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7
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explain select * from t1 ignore index (btree_idx) where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx heap_idx 20 const 7 Using where
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH
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t1 1 heap_idx 1 name NULL 13 NULL NULL HASH
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH
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t1 1 heap_idx 1 name NULL 13 NULL NULL HASH
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE
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create table t3
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(
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a varchar(20) not null,
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b varchar(20) not null,
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key (a,b)
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) engine=heap;
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insert into t3 select name, name from t1;
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show index from t3;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t3 1 a 1 a NULL NULL NULL NULL HASH
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t3 1 a 2 b NULL 13 NULL NULL HASH
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show index from t3;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t3 1 a 1 a NULL NULL NULL NULL HASH
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t3 1 a 2 b NULL 13 NULL NULL HASH
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explain select * from t1 ignore key(btree_idx), t3 where t1.name='matt' and t3.a = concat('',t1.name) and t3.b=t1.name;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx heap_idx 20 const 7 Using where
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1 SIMPLE t3 ref a a 40 func,const 7 Using where
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drop table t1, t2, t3;
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create temporary table t1 ( a int, index (a) ) engine=memory;
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insert into t1 values (1),(2),(3),(4),(5);
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select a from t1 where a in (1,3);
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a
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1
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3
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explain select a from t1 where a in (1,3);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 2 Using where
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drop table t1;
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