MySql数据分区操作之新增分区操作

2024-07-24 12:42:50

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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：

代码如下:
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

代码如下:
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

代码如下:
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

代码如下:
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

代码如下:
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

代码如下:
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

代码如下:
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

代码如下:
ALTER TABLE members ADD PARTITION (PARTITION p3 VALUES LESS THAN (2000));

代码如下:
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：http://www.bitsCN.com/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。

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