MySQL 5.5 range分区增加删除处理的方法示例

介绍

RANGE分区基于一个给定的连续区间范围，早期版本RANGE主要是基于整数的分区。在5.7版本中DATE、DATETIME列也可以使用RANGE分区，同时在5.5以上的版本提供了基于非整形的RANGE COLUMN分区。RANGE分区必须的连续的且不能重叠。使用

“VALUES LESS THAN ()” 来定义分区区间,非整形的范围值需要使用单引号，并且可以使用MAXVALUE作为分区的最高值。

本文将给大家介绍MySQL 5.5 range分区增加删除处理的相关内容，分享给大家供大家参考学习，下面来看看详细的介绍：

一、删除分区

##查看要处理的分区的数据量，并导出作为备份mysql> select count(*) from baby_account_change_log where updated_time >'2016-12-01 00:00:00' and updated_time <'2017-01-01 00:00:00';+----------+| count(*) |+----------+| 66252 | +----------+1 row in set (0.23 sec)##导出备份mysql> select * into outfile '/tmp/baby_account_change_log_p1.sql' from baby_account_change_log where updated_time >'2016-12-01 00:00:00' and updated_time <'2017-01-01 00:00:00' limit 100000000000;Query OK, 66252 rows affected (2.71 sec)##确认要处理分区mysql> explain partitions select count(*) from baby_account_change_log where updated_time >'2016-12-01 00:00:00' and updated_time <'2017-01-01 00:00:00';+----+-------------+-------------------------------+------------+-------+---------------+---------+---------+------+-------+--------------------------+| id | select_type | table       | partitions | type | possible_keys | key  | key_len | ref | rows | Extra     |+----+-------------+-------------------------------+------------+-------+---------------+---------+---------+------+-------+--------------------------+| 1 | SIMPLE  | baby_account_change_log | p1   | index | NULL   | PRIMARY | 8  | NULL | 66252 | Using where; Using index | +----+-------------+-------------------------------+------------+-------+---------------+---------+---------+------+-------+--------------------------+##删除分区mysql> alter table baby_account_change_log drop partition p0;Query OK, 0 rows affected (0.01 sec)

#错误提示删除存储最大值分区mysql> alter table baby_account_change_log add partition(PARTITION p13 VALUES LESS THAN (unix_timestamp('2017-12-31 23:59:59')));ERROR 1481 (HY000): MAXVALUE can only be used in last partition definition#删除存储最大值分区mysql> alter table baby_account_change_log drop partition p12;##增加新的分区mysql> alter table baby_account_change_log add partition(PARTITION p12 VALUES LESS THAN (unix_timestamp('2017-12-31 23:59:59')));

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