MySQL自动按半月一个分区自动分区
http://blog.chinaunix.net/uid-24086995-id-127389.html
drop table if exists terminal_parameter;
CREATE TABLE `terminal_parameter` (
`terminal_parameter_id` int(11) NOT NULL AUTO_INCREMENT,
`serial` int(11) DEFAULT NULL,
`network_type` char(1) DEFAULT NULL,
`mcc` int(8) DEFAULT NULL,
`mnc` int(8) DEFAULT NULL,
`lac` int(8) DEFAULT NULL,
`cellid` int(8) DEFAULT NULL,
`bsic_psc` int(8) DEFAULT NULL,
`ta_ec_io` int(8) DEFAULT NULL,
`bcch_rxlev_rscp` int(8) DEFAULT NULL,
`arfcn_uarfcn` int(8) DEFAULT NULL,
`rxq` int(8) DEFAULT NULL,
`c1` int(8) DEFAULT NULL,
`c2` int(8) DEFAULT NULL,
`signal_intensity` int(8) DEFAULT NULL,
`error_rate` int(8) DEFAULT NULL,
`alarm_type` varchar(16) DEFAULT NULL,
`txpower` int(8) DEFAULT NULL,
`small_running_number` int(8) DEFAULT NULL,
`createtime` datetime NOT NULL,
`userid` int(8) NOT NULL,
`terminal_id` int(8) DEFAULT NULL,
`state` char(1) DEFAULT '0',
`order_definition_id` int(8) DEFAULT NULL,
`order_code` varchar(20) DEFAULT NULL,
`charg_voltage` float(8,2) DEFAULT NULL,
`battery_voltage` float(8,2) DEFAULT NULL,
`temprad` float(8,2) DEFAULT NULL,
`run_state` int(8) DEFAULT NULL,
`switching_value1` int(8) DEFAULT NULL,
`switching_value2` int(8) DEFAULT NULL,
`bcch_freq` int(8) DEFAULT NULL,
`rxlev` int(8) DEFAULT NULL,
`rxlev_full` int(8) DEFAULT NULL,
`rxlev_sub` int(8) DEFAULT NULL,
`rxqual` int(8) DEFAULT NULL,
`rxqual_full` int(8) DEFAULT NULL,
`rxqual_sub` int(8) DEFAULT NULL,
`idle_ts` int(8) DEFAULT NULL,
`timing_advance` int(8) DEFAULT NULL,
`tch_efr_out` int(8) DEFAULT NULL,
`tch_efr_in` int(8) DEFAULT NULL,
`dtx` int(8) DEFAULT NULL,
`major_cycle_frequency` int(8) DEFAULT NULL,
PRIMARY KEY (`terminal_parameter_id`,`createtime`),
KEY `idx_createtime` (`createtime`),
KEY `idx_terminal_id` (`terminal_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
PARTITION BY RANGE(TO_DAYS (createtime))
(
PARTITION p20101115 VALUES LESS THAN (TO_DAYS('2010-11-15')),
PARTITION p20101130 VALUES LESS THAN (TO_DAYS('2010-11-30')),
PARTITION p20101215 VALUES LESS THAN (TO_DAYS('2010-12-15')),
PARTITION p20101231 VALUES LESS THAN (TO_DAYS('2010-12-31')),
PARTITION p20110115 VALUES LESS THAN (TO_DAYS('2011-01-15')),
PARTITION p20110131 VALUES LESS THAN (TO_DAYS('2011-01-31')),
PARTITION p20110215 VALUES LESS THAN (TO_DAYS('2011-02-15')),
PARTITION p20110228 VALUES LESS THAN (TO_DAYS('2011-02-28')),
PARTITION p20110315 VALUES LESS THAN (TO_DAYS('2011-03-15')),
PARTITION p20110331 VALUES LESS THAN (TO_DAYS('2011-03-31')),
PARTITION p20110415 VALUES LESS THAN (TO_DAYS('2011-04-15')),
PARTITION p20110430 VALUES LESS THAN (TO_DAYS('2011-04-30'))
);
存储过程代码：
* 每隔15天执行一次
/* 程序功能：循环使用分区，每半个月一个分区，保留6个月的数据
时间：2010-11-09 */
drop procedure if exists Set_Partition;
create procedure Set_Partition()
begin
/* 事务回滚，其实放这里没什么作用，ALTER TABLE是隐式提交，回滚不了的。*/
declare exit handler for sqlexception rollback;
start TRANSACTION;
/* 到系统表查出这个表的最大分区，得到最大分区的日期。在创建分区的时候，名称就以日期格式存放，方便后面维护 */
select REPLACE(partition_name,'p','') into @P12_Name from INFORMATION_SCHEMA.PARTITIONS where TABLE_SCHEMA='mydb_1' and table_name='terminal_parameter' order by partition_ordinal_position DESC limit 1;
/* 判断最大分区的时间段，如果是前半个月的，那么根据情况需要加13,14,15,16天
如果是后半个月的，那么直接加15天。 +0 是为了把日期都格式化成YYYYMMDD这样的格式*/
IF (DAY(@P12_Name)<=15) THEN
CASE day(LAST_DAY(@P12_name))
WHEN 31 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 16 DAY))+0 ;
WHEN 30 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 15 DAY))+0 ;
WHEN 29 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 14 DAY))+0 ;
WHEN 28 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 13 DAY))+0 ;
END CASE;
ELSE
set @Max_date= date(DATE_ADD(@P12_Name+0, INTERVAL 15 DAY))+0;
END IF;
/* 修改表，在最大分区的后面增加一个分区，时间范围加半个月 */
SET @s1=concat('ALTER TABLE terminal_parameter ADD PARTITION (PARTITION p',@Max_date,' VALUES LESS THAN (TO_DAYS (''',date(@Max_date),''')))');
PREPARE stmt2 FROM @s1;
EXECUTE stmt2;
DEALLOCATE PREPARE stmt2;
/* 取出最小的分区的名称，并删除掉 。
注意：删除分区会同时删除分区内的数据，慎重 */
select partition_name into @P0_Name from INFORMATION_SCHEMA.PARTITIONS where TABLE_SCHEMA='mydb_1' and table_name='terminal_parameter' order by partition_ordinal_position limit 1;
SET @s=concat('ALTER TABLE terminal_parameter DROP PARTITION ',@P0_Name);
PREPARE stmt1 FROM @s;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
/* 提交 */
COMMIT ;
end;
计划任务代码：
CREATE EVENT e_Set_Partition
ON SCHEDULE
EVERY 15 day STARTS '2011-04-30 23:59:59'
DO
call Set_Partition();