MySQL5.5 RANGE分区增加删除处理
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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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