MySQL中怎么实现表分区功能

60次阅读

共计 3605 个字符，预计需要花费 10 分钟才能阅读完成。

今天就跟大家聊聊有关 MySQL 中怎么实现表分区功能，可能很多人都不太了解，为了让大家更加了解，丸趣 TV 小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

MySQL 表分区功能基础
创建分区表
CREATE TABLE ` 表名 ` (
`EQUIPMENTID` char(17) NOT NULL,
`ATTRIBUTEID` char(4) NOT NULL,
`VALUE` varchar(20) NOT NULL,
`COLLECTTIME` datetime NOT NULL
)
ENGINE=InnoDB (适用大部分引擎, 可根据需要调整)
DEFAULT CHARSET=gbk(编码可根据需要修改)
PARTITION BY RANGE (to_days(COLLECTTIME))
(PARTITION pmin VALUES LESS THAN (to_days( 2010-01-01)),
PARTITION p201001 VALUES LESS THAN (to_days( 2010-02-01)) ,
PARTITION p201002 VALUES LESS THAN (to_days( 2010-03-01)) ,
PARTITION p201003 VALUES LESS THAN (to_days( 2010-04-01)) ,
PARTITION p201004 VALUES LESS THAN (to_days( 2010-05-01)) ,
PARTITION p201005 VALUES LESS THAN (to_days( 2010-06-01)) ,
PARTITION p201006 VALUES LESS THAN (to_days( 2010-07-01)) ,
PARTITION p201007 VALUES LESS THAN (to_days( 2010-08-01)) ,
PARTITION p201008 VALUES LESS THAN (to_days( 2010-09-01)) ,
PARTITION p201009 VALUES LESS THAN (to_days( 2010-10-01)) ,
PARTITION p201010 VALUES LESS THAN (to_days( 2010-11-01)),
PARTITION p201011 VALUES LESS THAN (to_days( 2010-12-01)),
PARTITION p201012 VALUES LESS THAN (to_days( 2011-01-01)),
PARTITION p201101 VALUES LESS THAN (to_days( 2011-02-01)),
PARTITION p201102 VALUES LESS THAN (to_days( 2011-03-01)),
PARTITION p201103 VALUES LESS THAN (to_days( 2011-04-01)),
PARTITION p201104 VALUES LESS THAN (to_days( 2011-05-01)),
PARTITION p201105 VALUES LESS THAN (to_days( 2011-06-01)),
PARTITION p201106 VALUES LESS THAN (to_days( 2011-07-01)),
PARTITION p201107 VALUES LESS THAN (to_days( 2011-08-01)),
PARTITION p201108 VALUES LESS THAN (to_days( 2011-09-01)),
PARTITION p201109 VALUES LESS THAN (to_days( 2011-10-01)),
PARTITION p201110 VALUES LESS THAN (to_days( 2011-11-01)),
PARTITION p201111 VALUES LESS THAN (to_days( 2011-12-01)),
PARTITION p201112 VALUES LESS THAN (to_days( 2012-01-01)),
PARTITION pmax VALUES LESS THAN MAXVALUE );
为现有表创建分区
alter table 表名
PARTITION BY RANGE (to_days(COLLECTTIME))
(PARTITION pmin VALUES LESS THAN (to_days( 2010-01-01)),
PARTITION p201001 VALUES LESS THAN (to_days( 2010-02-01)) ,
PARTITION p201002 VALUES LESS THAN (to_days( 2010-03-01)) ,
PARTITION p201003 VALUES LESS THAN (to_days( 2010-04-01)) ,
PARTITION p201004 VALUES LESS THAN (to_days( 2010-05-01)) ,
PARTITION p201005 VALUES LESS THAN (to_days( 2010-06-01)) ,
PARTITION p201006 VALUES LESS THAN (to_days( 2010-07-01)) ,
PARTITION p201007 VALUES LESS THAN (to_days( 2010-08-01)) ,
PARTITION p201008 VALUES LESS THAN (to_days( 2010-09-01)) ,
PARTITION p201009 VALUES LESS THAN (to_days( 2010-10-01)) ,
PARTITION p201010 VALUES LESS THAN (to_days( 2010-11-01)),
PARTITION p201011 VALUES LESS THAN (to_days( 2010-12-01)),
PARTITION p201012 VALUES LESS THAN (to_days( 2011-01-01)),
PARTITION p201101 VALUES LESS THAN (to_days( 2011-02-01)),
PARTITION p201102 VALUES LESS THAN (to_days( 2011-03-01)),
PARTITION p201103 VALUES LESS THAN (to_days( 2011-04-01)),
PARTITION p201104 VALUES LESS THAN (to_days( 2011-05-01)),
PARTITION p201105 VALUES LESS THAN (to_days( 2011-06-01)),
PARTITION p201106 VALUES LESS THAN (to_days( 2011-07-01)),
PARTITION p201107 VALUES LESS THAN (to_days( 2011-08-01)),
PARTITION p201108 VALUES LESS THAN (to_days( 2011-09-01)),
PARTITION p201109 VALUES LESS THAN (to_days( 2011-10-01)),
PARTITION p201110 VALUES LESS THAN (to_days( 2011-11-01)),
PARTITION p201111 VALUES LESS THAN (to_days( 2011-12-01)),
PARTITION p201112 VALUES LESS THAN (to_days( 2012-01-01)),
PARTITION pmax VALUES LESS THAN MAXVALUE );
如果表中已有数据, 分区时会自动进行分区存储, 不必担心数据丢失或者手动分类数据.
删除表中的指定分区
ALTER TABLE 表名 DROP PARTITION 分区名;
追加表分区
ALTER TABLE 表名 DROP PARTITION pmax;
ALTER TABLE 表名
ADD PARTITION (
PARTITION p201201 VALUES LESS THAN (to_days( 2012-2-1)),
PARTITION pmax VALUES LESS THAN MAXVALUE);
查看标分区信息
SELECT
partition_name part,
partition_expression expr,
partition_description descr,
table_rows
FROM
INFORMATION_SCHEMA.partitions
WHERE
TABLE_SCHEMA = schema()
AND TABLE_NAME= 表名
查看查询语句涉及分区信息
explain partitions
select hellip; from 表名 where hellip;;
该操作只查看查询语句相关的分区信息, 不会返回查询结果.