Mysql 日志表按照时间分区
1 典型的时间分区
drop table pss_log;
CREATE TABLE `pss_log` (
`id` bigint(18) NOT NULL AUTO_INCREMENT,
`method_name` varchar(100) NOT NULL COMMENT '方法名',
`input` text COMMENT '方法输入',
`output` text COMMENT '方法输出',
`client_ip` varchar(16) DEFAULT NULL COMMENT '调用ip',
`server_ip` varchar(16) DEFAULT NULL COMMENT '服务器ip',
`invoked_by` varchar(80) DEFAULT NULL COMMENT '调用方',
`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '创建时间',
`ticket` varchar(36) NOT NULL COMMENT '调用id',
`result_code` varchar(10) DEFAULT NULL COMMENT '方法结果码,用于表示是否成功',
`version` varchar(20) DEFAULT NULL COMMENT '客户端调用版本',
`time_used` int(10) DEFAULT NULL COMMENT '服务端耗时',
PRIMARY KEY (`id`,`create_time`),
KEY `idx_pss_log_create_time` (`method_name`,`create_time`,`invoked_by`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
PARTITION BY RANGE(UNIX_TIMESTAMP(`create_time`))
(PARTITION P20140701 VALUES LESS THAN (UNIX_TIMESTAMP('2014-07-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20140801 VALUES LESS THAN (UNIX_TIMESTAMP('2014-08-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20140901 VALUES LESS THAN (UNIX_TIMESTAMP('2014-09-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20141001 VALUES LESS THAN (UNIX_TIMESTAMP('2014-10-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20141101 VALUES LESS THAN (UNIX_TIMESTAMP('2014-11-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20141201 VALUES LESS THAN (UNIX_TIMESTAMP('2014-12-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150101 VALUES LESS THAN (UNIX_TIMESTAMP('2015-01-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150201 VALUES LESS THAN (UNIX_TIMESTAMP('2015-02-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150301 VALUES LESS THAN (UNIX_TIMESTAMP('2015-03-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150401 VALUES LESS THAN (UNIX_TIMESTAMP('2015-04-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150501 VALUES LESS THAN (UNIX_TIMESTAMP('2015-05-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150601 VALUES LESS THAN (UNIX_TIMESTAMP('2015-06-01 00:00:00')) ENGINE = InnoDB,
PARTITION P20150701 VALUES LESS THAN (UNIX_TIMESTAMP('2015-07-01 00:00:00')) ENGINE = InnoDB
);
2 检验分区
insert into pss_log (method_name,create_time,ticket) values('clyde1', '2014-06-01 00:00:00' ,'ticket1');
insert into pss_log (method_name,create_time,ticket) values( 'clyde2', '2014-06-02 00:00:00' ,'ticket1');
explain PARTITIONS select * from pss_log where CREATE_TIME<'2014-07-05 00:00:00'
从执行计划可以看出, 由于create_time<'2014-07-05 00:00:00' ,索引只会在2个分区P20140701,P20140801中查找,但用的2个partition的全表扫描
explain select * from pss_log where CREATE_TIME<'2014-07-05 00:00:00'
| id |
select_type |
partitions |
type |
possible_keys |
key |
rows |
Extra |
| 1 |
SIMPLE |
P20140701,P20140801 |
ALL |
NULL |
NULL |
1 |
Using where |
where 语句中增加method_name条件,会用到了索引
explain partitions select * from pss_log where method_name='clyde1' and CREATE_TIME<'2014-07-05 00:00:00'
| id |
select_type |
partitions |
type |
possible_keys |
key |
rows |
Extra |
| 1 |
SIMPLE |
P20140701,P20140801 |
range |
idx_pss_log_create_time |
idx_pss_log_create_time |
1 |
Using where |
如果时间范围更小的话,就会只在一个分区中找
explain partitions select * from pss_log where method_name='clyde1' and CREATE_TIME<'2014-07-05 00:00:00' and create_time>'2014-07-02 00:00:00';
| id |
select_type |
partitions |
type |
possible_keys |
key |
rows |
Extra |
| 1 |
SIMPLE |
P20140801 |
range |
idx_pss_log_create_time |
idx_pss_log_create_time |
1 |
Using where |
3 另外条件允许的话,partitions分得越小越好,