时间：2020-10-10 11:46:32 | 栏目：Mysql | 点击：次
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)
二、增加分区
#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')));
总结