1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
SET DEFAULT_STORAGE_ENGINE='tokudb';
DROP TABLE IF EXISTS t1;
create table t1(a int, b int, c int, d int, primary key(a), key(b) clustering=yes, key (c))engine=tokudb;
insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3),(4,4,4,4),(5,5,5,5),(6,6,6,6),(7,7,7,7),(8,8,8,8),(9,9,9,9);
explain select * from t1 where b > 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 5 NULL NULL; Using where; Using index
explain select * from t1 where c > 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL c NULL NULL NULL NULL; Using where
explain select * from t1 where a > 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL NULL; Using where
explain select * from t1 where c > 7;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c c 5 NULL NULL; Using where
explain select * from t1 where b > 7;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 5 NULL NULL; Using where; Using index
explain select a from t1 where b > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index b b 5 NULL NULL; Using where; Using index
explain select a from t1 where c > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index c c 5 NULL NULL; Using where; Using index
drop table t1;
|
