MYSQL-- 每半月一个分区，自动维护 （顶）

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=utf8PARTITION 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();

转载于：http://blog.chinaunix.net/uid-24086995-id-127389.html