mysql 中怎么定時添加刪除歷史分區

mysql 中怎么定時添加刪除歷史分區，很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細講解，有這方面需求的人可以來學習下，希望你能有所收獲。

1. 新建表

CREATE TABLE `perf_biz_vm_new` (

           `CREATE_TIME` datetime NOT NULL COMMENT '性能采集時間',

           `VM_ID` varchar(80) NOT NULL COMMENT '虛擬機ID',

            `PROCESSOR_USED` varchar(100) DEFAULT NULL COMMENT 'CPU利用率(%)',

            `MEM_USED` varchar(100) DEFAULT NULL COMMENT '內存的使用率(%)',

            `MEM_UTILITY` varchar(100) DEFAULT NULL COMMENT '可用內存量(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運行隊列中進程個數',

            `WRITE_IO` varchar(100) DEFAULT NULL COMMENT '虛擬磁盤寫入速率(Mb/s)',

            `READ_IO` varchar(100) DEFAULT NULL COMMENT '虛擬磁盤讀取速率(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='虛擬機性能采集表'

 /*!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. 更換表名

 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天的數據插入到新表里面.

#!/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.編寫存儲過程用于定期創建新的分區，并刪除幾天前舊的分區

代碼如下：

delimiter $$

CREATE  PROCEDURE clean_partiton(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64)，reserve INT)

BEGIN

      -- 注：該儲存過程適用于分區字段類型為datetime，按天分區且命名為p20180301格式規范的分區表

--     獲取最舊一個分區，判斷是否為reserve天前分區，是則進行刪除，每次只刪除一個分區

--     提前創建14天分區，判斷命名不重復則創建

--     創建 history_partition 表，varchar(200)和datetime類型。記錄執行成功的SQL語句

        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：創建名稱為clean_perf_biz_vm的事件，并在每天凌晨00:30:00的時候調用clean_partition存儲過程創建下一個新分區，并刪除兩天前的舊分區。

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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