mirror of
https://github.com/MariaDB/server.git
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548 lines
26 KiB
Plaintext
548 lines
26 KiB
Plaintext
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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create table t1 ( a int not null) partition by hash(a) partitions 2;
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insert into t1 values (1),(2),(3);
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explain select * from t1 where a=5 and a=6;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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drop table t1;
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create table t1 (
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a int(11) not null
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) partition by hash (a) partitions 2;
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a=1 or a=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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create table t2 (
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a int not null,
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b int not null
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) partition by key(a,b) partitions 2;
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insert into t2 values (1,1),(2,2),(3,3);
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explain partitions select * from t2 where a=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t2 where b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t2 where a=1 and b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0 ALL NULL NULL NULL NULL 3 Using where
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create table t3 (
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a int
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)
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partition by range (a*1) (
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partition p0 values less than (10),
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partition p1 values less than (20)
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);
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insert into t3 values (5),(15);
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explain partitions select * from t3 where a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=20;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=30;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t4 (a int not null, b int not null) partition by LIST (a+b) (
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partition p0 values in (12),
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partition p1 values in (14)
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);
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insert into t4 values (10,2), (10,4);
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explain partitions select * from t4 where (a=10 and b=1) or (a=10 and b=2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t4
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where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t4 where (a=10 and b=2) or (a=10 and b=3)
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or (a=10 and b = 4);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t4 where (a=10 and b=1) or a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t4 where (a=10 and b=2) or a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t1, t2, t3, t4;
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create table t5 (a int not null, b int not null,
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c int not null, d int not null)
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partition by LIST(a+b) subpartition by HASH (c+d) subpartitions 2
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(
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partition p0 values in (12),
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partition p1 values in (14)
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);
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insert into t5 values (10,2,0,0), (10,4,0,0), (10,2,0,1), (10,4,0,1);
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explain partitions select * from t5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1 ALL NULL NULL NULL NULL 4
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explain partitions select * from t5
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where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
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or (a=10 and b = 4);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t5 where (c=1 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p1_p1sp0 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
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(c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
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(b=2 and c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 3 Using where
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create table t6 (a int not null) partition by LIST(a) (
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partition p1 values in (1),
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partition p3 values in (3),
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partition p5 values in (5),
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partition p7 values in (7),
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partition p9 values in (9)
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);
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insert into t6 values (1),(3),(5);
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explain partitions select * from t6 where a < 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a <= 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a > 9;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a >= 9;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a > 0 and a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1,p3 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t6 where a > 5 and a < 12;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a > 3 and a < 8 ;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p5,p7 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a >= 0 and a <= 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1,p3,p5 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t6 where a >= 5 and a <= 12;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p5,p7,p9 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a >= 3 and a <= 8;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p3,p5,p7 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t6 where a > 3 and a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t7 (a int not null) partition by RANGE(a) (
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partition p10 values less than (10),
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partition p30 values less than (30),
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partition p50 values less than (50),
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partition p70 values less than (70),
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partition p90 values less than (90)
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);
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insert into t7 values (10),(30),(50);
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explain partitions select * from t7 where a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a < 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a <= 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p10,p30 system NULL NULL NULL NULL 1
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explain partitions select * from t7 where a = 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p30 system NULL NULL NULL NULL 1
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explain partitions select * from t7 where a < 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p10,p30,p50,p70,p90 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t7 where a = 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a > 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a >= 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a > 11 and a < 29;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t8 (a date not null) partition by RANGE(YEAR(a)) (
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partition p0 values less than (1980),
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partition p1 values less than (1990),
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partition p2 values less than (2000)
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);
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insert into t8 values ('1985-05-05'),('1995-05-05');
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explain partitions select * from t8 where a < '1980-02-02';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t9 (a date not null) partition by RANGE(TO_DAYS(a)) (
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partition p0 values less than (732299), -- 2004-12-19
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partition p1 values less than (732468), -- 2005-06-06
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partition p2 values less than (732664) -- 2005-12-19
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);
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insert into t9 values ('2005-05-05'), ('2005-04-04');
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explain partitions select * from t9 where a < '2004-12-19';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t9 where a <= '2004-12-19';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t9 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t5,t6,t7,t8,t9;
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create table t1 (a enum('a','b','c','d') default 'a')
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partition by hash (ascii(a)) partitions 2;
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insert into t1 values ('a'),('b'),('c');
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explain partitions select * from t1 where a='b';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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drop table t1;
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create table t1 (
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a1 int not null
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)
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partition by range (a1) (
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partition p0 values less than (3),
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partition p1 values less than (6),
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partition p2 values less than (9)
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);
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a1 > 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t1 where a1 >= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a1 < 3 and a1 > 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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drop table t1;
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create table t3 (a int, b int)
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partition by list(a) subpartition by hash(b) subpartitions 4 (
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partition p0 values in (1),
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partition p1 values in (2),
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partition p2 values in (3),
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partition p3 values in (4)
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);
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insert into t3 values (1,1),(2,2),(3,3);
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explain partitions select * from t3 where a=2 or b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p0_p0sp1,p1_p1sp0,p1_p1sp1,p1_p1sp2,p1_p1sp3,p2_p2sp1,p3_p3sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t3 where a=4 or b=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp0,p3_p3sp1,p3_p3sp2,p3_p3sp3 system NULL NULL NULL NULL 1
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explain partitions select * from t3 where (a=2 or b=1) and (a=4 or b=2) ;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p1_p1sp2,p3_p3sp1 system NULL NULL NULL NULL 1
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drop table t3;
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create table t1 (a int) partition by hash(a) partitions 2;
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insert into t1 values (1),(2);
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explain partitions select * from t1 where a is null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t1 where a is not null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t1;
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create table t1 (a int not null, b int not null, key(a), key(b))
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partition by hash(a) partitions 4;
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insert into t1 values (1,1),(2,2),(3,3),(4,4);
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explain partitions
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select * from t1 X, t1 Y
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where X.b = Y.b and (X.a=1 or X.a=2) and (Y.a=2 or Y.a=3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE X p1,p2 ALL a,b NULL NULL NULL 2 Using where
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1 SIMPLE Y p2,p3 ref a,b b 4 test.X.b 2 Using where
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explain partitions
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select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE X p1,p2 ALL a NULL NULL NULL 2 Using where
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1 SIMPLE Y p1,p2 ref a a 4 test.X.a 2
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drop table t1;
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create table t1 (a int) partition by hash(a) partitions 20;
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a > 1 and a < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a >= 1 and a < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a > 1 and a <= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p2,p3 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a >= 1 and a <= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2,p3 ALL NULL NULL NULL NULL 3 Using where
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drop table t1;
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create table t1 (a int, b int)
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partition by list(a) subpartition by hash(b) subpartitions 20
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(
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partition p0 values in (0),
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partition p1 values in (1),
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partition p2 values in (2),
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partition p3 values in (3)
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);
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insert into t1 values (1,1),(2,2),(3,3);
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explain partitions select * from t1 where b > 1 and b < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where b > 1 and b < 3 and (a =1 or a =2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1_p1sp2,p2_p2sp2 system NULL NULL NULL NULL 1
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drop table t1;
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create table t1 (a int) partition by list(a) (
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partition p0 values in (1,2),
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partition p1 values in (3,4)
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);
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insert into t1 values (1),(1),(2),(2),(3),(4),(3),(4);
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flush status;
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update t1 set a=100 where a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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update t1 set a=100 where a+1=5+1;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 10
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flush status;
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delete from t1 where a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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delete from t1 where a+1=5+1;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 10
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create table t2 like t1;
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insert into t2 select * from t2;
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flush status;
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update t1,t2 set t1.a=1000, t2.a=1000 where t1.a=5 and t2.a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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delete t1,t2 from t1, t2 where t1.a=5 and t2.a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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drop table t1,t2;
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CREATE TABLE `t1` (
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`a` int(11) default NULL
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);
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INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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CREATE TABLE `t2` (
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`a` int(11) default NULL,
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KEY `a` (`a`)
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) ;
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insert into t2 select A.a + 10*(B.a + 10* C.a) from t1 A, t1 B, t1 C ;
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insert into t1 select a from t2;
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drop table t2;
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CREATE TABLE `t2` (
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`a` int(11) default NULL,
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`b` int(11) default NULL
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)
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PARTITION BY RANGE (a) (
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PARTITION p0 VALUES LESS THAN (200),
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PARTITION p1 VALUES LESS THAN (400),
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PARTITION p2 VALUES LESS THAN (600),
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PARTITION p3 VALUES LESS THAN (800),
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PARTITION p4 VALUES LESS THAN (1001));
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insert into t2 select a,1 from t1 where a < 200;
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insert into t2 select a,2 from t1 where a >= 200 and a < 400;
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insert into t2 select a,3 from t1 where a >= 400 and a < 600;
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insert into t2 select a,4 from t1 where a >= 600 and a < 800;
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insert into t2 select a,5 from t1 where a >= 800 and a < 1001;
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explain partitions select * from t2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 1010
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explain partitions select * from t2 where a < 801 and a > 200;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p1,p2,p3,p4 ALL NULL NULL NULL NULL 800 Using where
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explain partitions select * from t2 where a < 801 and a > 800;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p4 ALL NULL NULL NULL NULL 200 Using where
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explain partitions select * from t2 where a > 600;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
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explain partitions select * from t2 where a > 600 and b = 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
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explain partitions select * from t2 where a > 600 and b = 4;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
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explain partitions select * from t2 where a > 600 and b = 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
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explain partitions select * from t2 where b = 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 1010 Using where
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flush status;
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update t2 set b = 100 where b = 6;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 1015
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flush status;
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update t2 set a = 1002 where a = 1001;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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update t2 set b = 6 where a = 600;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 201
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flush status;
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update t2 set b = 6 where a > 600 and a < 800;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 201
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flush status;
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delete from t2 where a > 600;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 402
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drop table t2;
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CREATE TABLE `t2` (
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`a` int(11) default NULL,
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`b` int(11) default NULL,
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index (b)
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)
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PARTITION BY RANGE (a) (
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|
PARTITION p0 VALUES LESS THAN (200),
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PARTITION p1 VALUES LESS THAN (400),
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PARTITION p2 VALUES LESS THAN (600),
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PARTITION p3 VALUES LESS THAN (800),
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PARTITION p4 VALUES LESS THAN (1001));
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insert into t2 select a,1 from t1 where a < 100;
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insert into t2 select a,2 from t1 where a >= 200 and a < 300;
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insert into t2 select a,3 from t1 where a >= 300 and a < 400;
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insert into t2 select a,4 from t1 where a >= 400 and a < 500;
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insert into t2 select a,5 from t1 where a >= 500 and a < 600;
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insert into t2 select a,6 from t1 where a >= 600 and a < 700;
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insert into t2 select a,7 from t1 where a >= 700 and a < 800;
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insert into t2 select a,8 from t1 where a >= 800 and a < 900;
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insert into t2 select a,9 from t1 where a >= 900 and a < 1001;
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explain partitions select * from t2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 910
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explain partitions select * from t2 where a = 101;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0 ALL NULL NULL NULL NULL 110 Using where
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explain partitions select * from t2 where a = 550;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p2 ALL NULL NULL NULL NULL 200 Using where
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explain partitions select * from t2 where a = 833;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p4 ALL NULL NULL NULL NULL 200 Using where
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explain partitions select * from t2 where (a = 100 OR a = 900);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p4 ALL NULL NULL NULL NULL 310 Using where
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explain partitions select * from t2 where (a > 100 AND a < 600);
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|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3 ALL NULL NULL NULL NULL 710 Using where
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explain partitions select * from t2 where b = 4;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1,p2,p3,p4 ref b b 5 const 76 Using where
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explain partitions select * from t2 where b = 6;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p1,p2,p3,p4 ref b b 5 const 76 Using where
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explain partitions select * from t2 where b in (1,3,5);
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|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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explain partitions select * from t2 where b in (2,4,6);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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explain partitions select * from t2 where b in (7,8,9);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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explain partitions select * from t2 where b > 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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explain partitions select * from t2 where b > 5 and b < 8;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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explain partitions select * from t2 where b > 5 and b < 7;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p1,p2,p3,p4 range b b 5 NULL 76 Using where
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explain partitions select * from t2 where b > 0 and b < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
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flush status;
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update t2 set a = 111 where b = 10;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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|
Handler_read_rnd_next 0
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show status like 'Handler_read_key';
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Variable_name Value
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|
Handler_read_key 5
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flush status;
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update t2 set a = 111 where b in (5,6);
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show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
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|
Handler_read_rnd_next 915
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|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
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|
flush status;
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update t2 set a = 222 where b = 7;
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show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
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|
show status like 'Handler_read_key';
|
|
Variable_name Value
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|
Handler_read_key 5
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|
flush status;
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delete from t2 where b = 7;
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|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
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|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 5
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|
flush status;
|
|
delete from t2 where b > 5;
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|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 1215
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|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
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|
show status like 'Handler_read_prev';
|
|
Variable_name Value
|
|
Handler_read_prev 0
|
|
show status like 'Handler_read_next';
|
|
Variable_name Value
|
|
Handler_read_next 0
|
|
flush status;
|
|
delete from t2 where b < 5 or b > 3;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 1215
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
|
|
show status like 'Handler_read_prev';
|
|
Variable_name Value
|
|
Handler_read_prev 0
|
|
show status like 'Handler_read_next';
|
|
Variable_name Value
|
|
Handler_read_next 0
|
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drop table t1, t2;
|