一、刪除分區
##查看要處理的分區的數據量，並導出作爲備份
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)
##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)
二、增加分區
#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')));