我想对mysql的表按datetime列进行分区,一天一个分区,创建表的脚本如下:CREATE TABLE raw_log_2011_4 (
id bigint(20) NOT NULL AUTO_INCREMENT,
logid char(16) NOT NULL,
tid char(16) NOT NULL,
reporterip char(46) DEFAULT NULL,
ftime datetime DEFAULT NULL,
KEY id (id)
) ENGINE=InnoDB AUTO_INCREMENT=286802795 DEFAULT CHARSET=utf8
PARTITION BY hash (day(ftime)) partitions 31;
但是当我查询一天的数据的时候,查询计划并不能直接定位分区。我的查询语句如下:explain partitions select * from raw_log_2011_4 where day(ftime) = 30;换了好多查询语句都不行。当我使用如下的语句,可以直接定位分区,但是不能查询一天的数据。explain partitions select * from raw_log_2011_4 where ftime = '2011-03-30';是否有方法能让我既能查询数据又可以利用分区,多谢!
id bigint(20) NOT NULL AUTO_INCREMENT,
logid char(16) NOT NULL,
tid char(16) NOT NULL,
reporterip char(46) DEFAULT NULL,
ftime datetime DEFAULT NULL,
KEY id (id)
) ENGINE=InnoDB AUTO_INCREMENT=286802795 DEFAULT CHARSET=utf8
PARTITION BY hash (day(ftime)) partitions 31;
但是当我查询一天的数据的时候,查询计划并不能直接定位分区。我的查询语句如下:explain partitions select * from raw_log_2011_4 where day(ftime) = 30;换了好多查询语句都不行。当我使用如下的语句,可以直接定位分区,但是不能查询一天的数据。explain partitions select * from raw_log_2011_4 where ftime = '2011-03-30';是否有方法能让我既能查询数据又可以利用分区,多谢!
结果如何
mysql只认识to_days(), year()两个分区函数
-> id bigint(20) NOT NULL AUTO_INCREMENT,
-> logid char(16) NOT NULL,
-> tid char(16) NOT NULL,
-> reporterip char(46) DEFAULT NULL,
-> ftime datetime DEFAULT NULL,
-> KEY id (id)
-> ) ENGINE=InnoDB AUTO_INCREMENT=286802795 DEFAULT CHARSET=utf8
-> PARTITION BY hash (to_days(ftime)) partitions 31;
Query OK, 0 rows affected (0.89 sec)mysql> explain partitions select * from raw_log_2011_5 where ftime = to_days('20
11-03-30')\G;
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: raw_log_2011_5
partitions: p8
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 2
Extra: Using where
1 row in set, 2 warnings (0.00 sec)ERROR:
No query specified
id bigint(20) NOT NULL AUTO_INCREMENT,
logid char(16) NOT NULL,
tid char(16) NOT NULL,
reporterip char(46) DEFAULT NULL,
ftime datetime DEFAULT NULL,
KEY id (id)
) ENGINE=InnoDB AUTO_INCREMENT=286802795 DEFAULT CHARSET=utf8
PARTITION BY hash (to_days(ftime)) partitions 31;explain partitions select * from raw_log_2011_4 where to_days(ftime) = to_days('2011-03-30');依旧是全表扫描。
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`logid` char(16) NOT NULL,
`tid` char(16) NOT NULL,
`reporterip` char(46) DEFAULT NULL,
`ftime` datetime DEFAULT NULL,
KEY `id` (`id`),
KEY `ftime` (`ftime`)
) ENGINE=InnoDB AUTO_INCREMENT=286802799 DEFAULT CHARSET=utf8
PARTITION BY HASH (to_days(ftime))
PARTITIONS 31
这样试试