MySql数据分区操作之新增分区操作

如果想在已经建好的表上进行分区，如果使用alter添加分区的话，mysql会提示错误：

ERROR 1505 <HY000> Partition management on a not partitioned table is not possible

正确的方法是新建一个具有分区的表，结构一致，然后用insert into 分区表 select * from 原始表;

测试创建分区表文件

CREATE TABLE tr (id INT, name VARCHAR(50), purchased DATE)

PARTITION BY RANGE(YEAR(purchased))

(

    PARTITION p0 VALUES LESS THAN (1990),

    PARTITION p1 VALUES LESS THAN (1995),

    PARTITION p2 VALUES LESS THAN (2000),

    PARTITION p3 VALUES LESS THAN (2005)

);

插入测试数据

INSERT INTO tr VALUES

(1, 'desk organiser', '2003-10-15′),

(2, 'CD player', '1993-11-05′),

(3, 'TV set', '1996-03-10′),

(4, 'bookcase', '1982-01-10′),

(5, 'exercise bike', '2004-05-09′),

(6, 'sofa', '1987-06-05′),

(7, 'popcorn maker', '2001-11-22′),

(8, 'aquarium', '1992-08-04′),

(9, 'study desk', '1984-09-16′),

(10, 'lava lamp', '1998-12-25′);

查询P2中的数据

select * from tr where purchased between '1995-01-01′ and '2004-12-31′;

如果删除P2，在删除P2分区的同时，也会将其下的所有数据删除

alter table tr drop partition p2;

show create table tr;

CREATE TABLE `tr` (

  `id` int(11) DEFAULT NULL,

  `name` varchar(50) DEFAULT NULL,

  `purchased` date DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=utf8

/*!50100 PARTITION BY RANGE (YEAR(purchased))

(PARTITION p0 VALUES LESS THAN (1990) ENGINE = MyISAM,

 PARTITION p1 VALUES LESS THAN (1995) ENGINE = MyISAM,

 PARTITION p3 VALUES LESS THAN (2005) ENGINE = MyISAM) */

 

再次插入数据时，会将原P2的数据插入至P3中

INSERT INTO tr VALUES (11, 'pencil holder', '1995-07-12′);

ALTER TABLE tr DROP PARTITION p3;

SELECT * FROM tr WHERE purchased  BETWEEN '1995-01-01′ AND '2004-12-31′;

创建一个新的测试表

CREATE TABLE members (

    id INT,

    fname VARCHAR(25),

    lname VARCHAR(25),

    dob DATE

)

PARTITION BY RANGE(YEAR(dob)) (

    PARTITION p0 VALUES LESS THAN (1970),

    PARTITION p1 VALUES LESS THAN (1980),

    PARTITION p2 VALUES LESS THAN (1990)

);

直接用alter table tablename add partition 方式再最后面添加分区

ALTER TABLE members ADD PARTITION (PARTITION p3 VALUES LESS THAN (2000));

ALTER TABLE members reorganize partition p0 into (

    partition m0 values less than (1960),

    partition m1 values less than (1970)

);

show create table members;

CREATE TABLE `members` (

  `id` int(11) DEFAULT NULL,

  `fname` varchar(25) DEFAULT NULL,

  `lname` varchar(25) DEFAULT NULL,

  `dob` date DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=utf8

/*!50100 PARTITION BY RANGE (YEAR(dob))

(PARTITION m0 VALUES LESS THAN (1960) ENGINE = MyISAM,

 PARTITION m1 VALUES LESS THAN (1970) ENGINE = MyISAM,

 PARTITION p1 VALUES LESS THAN (1980) ENGINE = MyISAM,

 PARTITION p2 VALUES LESS THAN (1990) ENGINE = MyISAM,

 PARTITION p3 VALUES LESS THAN (2000) ENGINE = MyISAM) */

 

使用 REORGANIZE PARTITION进行数据的合并与拆分，数据是没有丢失的。
(详细出处参考：/article/42544.htm)
如果用此方式在之前添加会报错，只能用另一种合并拆分分区的方式操作。