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'
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；
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