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‘)));

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MySQL5.5 RANGE分区增加删除处理