分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
也欢迎大家转载本篇文章。分享知识，造福人民，实现我们中华民族伟大复兴！
author：skate
time：2012/11/28
mysql分区---list partition
mysql的list分区和range的分区十分类似，只是list分区的范围是一列表，用PARTITION BY LIST(expr)类似定义，expr是基于一列或某列返回interger的表达式
list分区定义
mysql> show create table list_t;
CREATE TABLE `list_t` (
`c1` int(11) DEFAULT NULL,
`c2` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY LIST (c1)
(PARTITION p0 VALUES IN (1,4,7) ENGINE = InnoDB,
PARTITION p1 VALUES IN (2,5,8) ENGINE = InnoDB) */
mysql> insert into list_t values(1,3),(3,4),(4,5);
ERROR 1526 (HY000): Table has no partition for value 3
mysql> insert into list_t values(1,3),(5,4),(4,5);
Query OK, 3 rows affected (0.04 sec)
Records: 3 Duplicates: 0 Warnings: 0
清空表
mysql> truncate table list_t;
Query OK, 0 rows affected (0.12 sec)
忽略不匹配的行
mysql> insert ignore into list_t values(1,3),(3,4),(4,5);
Query OK, 2 rows affected (0.04 sec)
Records: 3 Duplicates: 1 Warnings: 0
mysql> select * from list_t;
+------+------+
| c1 | c2 |
+------+------+
| 1 | 3 |
| 4 | 5 |
+------+------+
2 rows in set (0.01 sec)
mysql>
添加分区
mysql> alter table list_t add partition (partition p2 values in (3,6,9));
Query OK, 0 rows affected (0.17 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table list_t;
CREATE TABLE `list_t` (
`c1` int(11) DEFAULT NULL,
`c2` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY LIST (c1)
(PARTITION p0 VALUES IN (1,4,7) ENGINE = InnoDB,
PARTITION p1 VALUES IN (2,5,8) ENGINE = InnoDB,
PARTITION p2 VALUES IN (3,6,9) ENGINE = InnoDB) */
mysql>
mysql> insert into list_t values(3,3),(6,4),(9,5);
Query OK, 3 rows affected (0.06 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from list_t;
+------+------+
| c1 | c2 |
+------+------+
| 1 | 3 |
| 4 | 5 |
| 3 | 3 |
| 6 | 4 |
| 9 | 5 |
+------+------+
5 rows in set (0.00 sec)
rebuild分区
mysql> alter table list_t rebuild partition p1;
Query OK, 0 rows affected (0.12 sec)
Records: 0 Duplicates: 0 Warnings: 0
检查分区表
mysql> alter table list_t check partition p1;
+--------------+-------+----------+----------+
| Table | Op | Msg_type | Msg_text |
+--------------+-------+----------+----------+
| skate.list_t | check | status | OK |
+--------------+-------+----------+----------+
1 row in set (0.02 sec)
收集统计信息
mysql> alter table list_t analyze partition p1;
+--------------+---------+----------+----------+
| Table | Op | Msg_type | Msg_text |
+--------------+---------+----------+----------+
| skate.list_t | analyze | status | OK |
+--------------+---------+----------+----------+
1 row in set (0.01 sec)
mysql>
清空表
mysql> alter table list_t truncate partition p1;
Query OK, 0 rows affected (0.04 sec)
删除分区表
mysql> alter table list_t drop partition p1;
Query OK, 0 rows affected (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql>
重命名分区
-------------------------------------------------
mysql> show create table list_t;
CREATE TABLE `list_t` (
`c1` int(11) DEFAULT NULL,
`c2` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY LIST (c1)
(PARTITION p0 VALUES IN (1,4,7) ENGINE = InnoDB,
PARTITION p2 VALUES IN (3,6,9) ENGINE = InnoDB,
PARTITION p1 VALUES IN (2,5,8) ENGINE = InnoDB) */
mysql> alter table list_t reorganize partition p0,p2 into ( partition p0 values in (1,4), partition p2 values in(7,3,6,9));
Query OK, 5 rows affected (0.26 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> show create table list_t;
CREATE TABLE `list_t` (
`c1` int(11) DEFAULT NULL,
`c2` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY LIST (c1)
(PARTITION p0 VALUES IN (1,4) ENGINE = InnoDB,
PARTITION p2 VALUES IN (7,3,6,9) ENGINE = InnoDB,
PARTITION p1 VALUES IN (2,5,8) ENGINE = InnoDB) */
---------------------------------------------------
-----end----
给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
