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
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
TRUNCATE TABLE t1;
INSERT INTO t1 (a,b) VALUES (1,'a'), (2,'b'), (3,'c');
TRUNCATE TABLE t1;
SELECT a,b FROM t1;
a b
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN> KEY AUTO_INCREMENT, c <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (a)
PARTITIONS 2 */
INSERT INTO t1 (c) VALUES ('a'),('b'),('c');
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (a)
PARTITIONS 2 */
TRUNCATE TABLE t1;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (a)
PARTITIONS 2 */
INSERT INTO t1 (c) VALUES ('d');
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (a)
PARTITIONS 2 */
SELECT a,c FROM t1;
a c
1 d
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(2,'d'),(4,'e'),(100,'f'),(101,'g');
ALTER TABLE t1 TRUNCATE PARTITION p0;
SELECT a,b FROM t1;
a b
1 a
101 g
3 c
EXPLAIN PARTITIONS SELECT a,b FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # #
INSERT INTO t1 (a,b) VALUES (1,'a'), (2,'b'), (3,'c');
ALTER TABLE t1 TRUNCATE PARTITION ALL;
SELECT a,b FROM t1;
a b
DROP TABLE t1;
|
