mysql 中怎样定时添加删除历史分区

        mysql 中怎么定时添加删除历史分区，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
 
1. 新建表
 
CREATE TABLE `perf_biz_vm_new` (
 
           `CREATE_TIME` datetime NOT NULL COMMENT '性能采集时间',
 
           `VM_ID` varchar(80) NOT NULL COMMENT '虚拟机ID',
 
            `PROCESSOR_USED` varchar(100) DEFAULT NULL COMMENT 'CPU利用率(%)',
 
            `MEM_USED` varchar(100) DEFAULT NULL COMMENT '内存的使用率(%)',
 
            `MEM_UTILITY` varchar(100) DEFAULT NULL COMMENT '可用内存量(bytes)',
 
            `BYTES_IN` varchar(100) DEFAULT NULL COMMENT '流入流量速率(Mbps)',
 
            `BYTES_OUT` varchar(100) DEFAULT NULL COMMENT '流出流量速率(Mbps)',
 
            `PROC_RUN` varchar(100) DEFAULT NULL COMMENT 'CPU运行队列中进程个数',
 
            `WRITE_IO` varchar(100) DEFAULT NULL COMMENT '虚拟磁盘写入速率(Mb/s)',
 
            `READ_IO` varchar(100) DEFAULT NULL COMMENT '虚拟磁盘读取速率(Mb/s)',
 
            `PID` varchar(36) NOT NULL,
 
             PRIMARY KEY (`PID`,`CREATE_TIME`),
 
             KEY `mytable_categoryid` (`CREATE_TIME`) USING BTREE,
 
             KEY `perf_biz_vm_vm_id_create_time` (`VM_ID`,`CREATE_TIME`)
 
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='虚拟机性能采集表'
 
 /*!50500 PARTITION BY RANGE  COLUMNS(CREATE_TIME)
 
(PARTITION p20180225 VALUES LESS THAN ('20180226') ENGINE = InnoDB,
 
 PARTITION p20180226 VALUES LESS THAN ('20180227') ENGINE = InnoDB,
 
 PARTITION p20180227 VALUES LESS THAN ('20180228') ENGINE = InnoDB,
 
 PARTITION p20180228 VALUES LESS THAN ('20180229') ENGINE = InnoDB,
 
 PARTITION p20180229 VALUES LESS THAN ('20180230') ENGINE = InnoDB) */
 
2. 更换表名
 
 rename table perf_biz_vm to perf_biz_vm_old;
 
rename table perf_biz_vm_new to perf_biz_vm;
 
3. 把最近2天的数据插入到新表里面.
 
#!/bin/bash
 
function insert(){
 
end_time="$1 $2"
 
start_time="$3 $4"
 
mysql -u'user' -p'passwd' << !
 
use monitor_alarm_openstack;
 
set innodb_flush_log_at_trx_commit=0;
 
start transaction;
 
insert into perf_biz_vm select * from perf_biz_vm_old where create_time < '$end_time' and create_time > '$start_time';
 
commit;
 
select TABLE_ROWS from information_schema.tables where TABLE_SCHEMA ="monitor_alarm" and TABLE_NAME="perf_biz_vm";
 
!
 
}
 
base_time="2018-02-27 2:00:00"
 
while true
 
do
 
        #end_time=$(date -d "-1hour $base_time" +%Y-%m-%d" "%H:%M:%S)
 
        end_time=$base_time
 
        start_time=$(date -d "-1hour $end_time" +%Y-%m-%d" "%H:%M:%S)
 
        #base_time=$end_time
 
        base_time=$start_time
 
        echo "Cur_time: $(date +%Y%m%d" "%H%M%S)" | tee -a 1.log
 
        echo "Range: $end_time $start_time" | tee -a 1.log
 
        insert ${end_time} ${start_time} | tee -a 1.log
 
        sleep 2
 
done
 
4.编写存储过程用于定期创建新的分区，并删除几天前旧的分区
 
代码如下：
 
delimiter $$
 
CREATE  PROCEDURE clean_partiton(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64)，reserve INT)
 
BEGIN
 
      -- 注：该储存过程适用于分区字段类型为datetime，按天分区且命名为p20180301格式规范的分区表
 
--     获取最旧一个分区，判断是否为reserve天前分区，是则进行删除，每次只删除一个分区
 
--     提前创建14天分区，判断命名不重复则创建
 
--     创建 history_partition 表，varchar(200)和datetime类型。记录执行成功的SQL语句
 
        DECLARE PARTITION_NAMES VARCHAR(16);    
 
        DECLARE OLD_PARTITION_NAMES VARCHAR(16);
 
        DECLARE LESS_THAN_TIMES varchar(16);     
 
        DECLARE CUR_TIME INT;                  
 
        DECLARE RETROWS INT;
 
        DECLARE DROP_PARTITION VARCHAR(16);
 
SET CUR_TIME = DATE_FORMAT(NOW(),'%Y%m%d');
 
        BEGIN
 
        SELECT PARTITION_NAME INTO DROP_PARTITION FROM information_schema.partitions WHERE table_schema = SCHEMANAME AND table_name = TABLENAME order by PARTITION_ORDINAL_POSITION  asc limit 1 ;
 
        IF SUBSTRING(DROP_PARTITION,2) < DATE_FORMAT(CUR_TIME - INTERVAL reserve DAY, '%Y%m%d') THEN
 
SET @sql = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' drop PARTITION ', DROP_PARTITION, ';' );
 
        PREPARE STMT FROM @sql;
 
        EXECUTE STMT;
 
        DEALLOCATE PREPARE STMT;
 
        INSERT INTO history_partition VALUES (@sql, now());
 
END IF;
 
        end;
 
        SET @__interval = 1;
 
        create_loop: LOOP
 
                IF @__interval > 15 THEN
 
                        LEAVE create_loop;
 
                END IF;
 
                SET LESS_THAN_TIMES = DATE_FORMAT(CUR_TIME + INTERVAL @__interval DAY, '%Y%m%d');
 
                SET PARTITION_NAMES = DATE_FORMAT(CUR_TIME + INTERVAL @__interval -1 DAY, 'p%Y%m%d');
 
                IF(PARTITION_NAMES != OLD_PARTITION_NAMES) THEN
 
                     SELECT COUNT(1) INTO RETROWS FROM information_schema.partitions WHERE table_schema = SCHEMANAME AND table_name = TABLENAME AND LESS_THAN_TIMES <= substring(partition_description,2,8) ;
 
                     IF  RETROWS = 0 THEN
 
                     SET @sql = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITION_NAMES, ' VALUES LESS THAN ( "',LESS_THAN_TIMES, '" ));' );
 
                     PREPARE STMT FROM @sql;
 
                     EXECUTE STMT;
 
                     DEALLOCATE PREPARE STMT;
 
INSERT INTO history_partition VALUES (@sql, now());
 
                     END IF;
 
                END IF;
 
                SET @__interval=@__interval+1;
 
                SET OLD_PARTITION_NAMES = PARTITION_NAMES;
 
        END LOOP;
 
END
 
$$
 
delimiter ;
 
Step 5：创建名称为clean_perf_biz_vm的事件，并在每天凌晨00:30:00的时候调用clean_partition存储过程创建下一个新分区，并删除两天前的旧分区。
 
delimiter |
 
CREATE DEFINER=’root’@’localhost’ event clean_perf_biz_vm on schedule every 1 day starts DATE_ADD(DATE_ADD(CURDATE(),INTERVAL 1 DAY),INTERVAL 30 MINUTE)
 
ON COMPLETION PRESERVE
 
do
 
begin
 
call clean_partition(‘monitor_alarm’,’perf_biz_vm’,’2’);
 
end |
 
delimiter；
 
看完上述内容是否对您有帮助呢？如