##查看要處理的分區的數據量，并導出作為備份mysql/51556.html">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)##導出備份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)##確認要處理分區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 | +----+-------------+-------------------------------+------------+-------+---------------+---------+---------+------+-------+--------------------------+##刪除分區mysql> alter table baby_account_change_log drop partition p0;Query OK, 0 rows affected (0.01 sec)

#錯誤提示刪除存儲最大值分區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#刪除存儲最大值分區mysql> alter table baby_account_change_log drop partition p12;##增加新的分區mysql> alter table baby_account_change_log add partition(PARTITION p12 VALUES LESS THAN (unix_timestamp('2017-12-31 23:59:59')));