详解mysql重建表分区并保留数据的相关方法(2)-木庄网络博客

1.创建log2，按时间分区（每月1个分区）

CREATE TABLE `log2` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `content` text NOT NULL COMMENT '内容', `status` tinyint(3) unsigned NOT NULL COMMENT '记录状态', `addtime` int(11) unsigned NOT NULL COMMENT '添加时间', `lastmodify` int(11) unsigned NOT NULL COMMENT '最后修改时间', PRIMARY KEY (`id`,`addtime`), KEY `id`(`id`), KEY `addtime`(`addtime`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
/*!50100 PARTITION BY RANGE (addtime)
(PARTITION p201801 VALUES LESS THAN (unix_timestamp('2018-02-01 00:00:00')) ENGINE = InnoDB,
PARTITION p201802 VALUES LESS THAN (unix_timestamp('2018-03-01 00:00:00')) ENGINE = InnoDB,
PARTITION p201803 VALUES LESS THAN (unix_timestamp('2018-04-01 00:00:00')) ENGINE = InnoDB,
PARTITION p201804 VALUES LESS THAN (unix_timestamp('2018-05-01 00:00:00')) ENGINE = InnoDB,
PARTITION pmax VALUES LESS THAN MAXVALUE ENGINE = InnoDB) */;

2.将log的数据复制到log2

insert into `log2` select * from `log`;

3.删除log表

drop table `log`;

4.将log2表改名为log

rename table `log2` to `log`;

执行后查看数据分区分布

SELECT PARTITION_NAME,TABLE_ROWS FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA='test' AND TABLE_NAME = 'log';+----------------+------------+| PARTITION_NAME | TABLE_ROWS |
+----------------+------------+| p201801        |          1 |
| p201802        |          1 |
| p201803        |          1 |
| p201804        |          0 || pmax           |          0 |
+----------------+------------+