SQLSERVER--定期清理维护作业的历史记录

执行该存储过程后，会在msdb数据库中嵌套地删除备份相关的N张表，其中一条删除语句如下：

 DELETE msdb.dbo.backupmediafamily
 FROM   msdb.dbo.backupmediafamily bmf
 WHERE  bmf.media_set_id IN ( SELECT    media_set_id
                              FROM      @media_set_id )
        AND ( ( SELECT  COUNT(*)
                FROM    msdb.dbo.backupset
                WHERE   media_set_id = bmf.media_set_id
              ) = 0 )

当备份和还原历史记录信息较多的时候，删除操作消耗的资源会成几何数增长，由于该服务器用作日志传送服务器，承载很多个数据库的日志传送，因此相关备份表中存有大量数据，导致删除操作长时间不能完成。

解决办法：

定期执行下面脚本来清理备份还原数据：

--设置历史记录保存期限为1天
DECLARE @keepMinutes BIGINT
SET @keepMinutes= 60*24

DECLARE @expiredDT NVARCHAR(100)
SELECT  @expiredDT = dbo.ufn_FormatDate(DATEADD(MINUTE, 0 - @keepMinutes,
                                                GETDATE()),
                                        ‘yyyy-MM-ddTHH:mm:ss‘)


EXEC msdb.dbo.sp_delete_backuphistory @expiredDT

EXEC msdb.dbo.sp_purge_jobhistory @oldest_date = @expiredDT

EXEC msdb.dbo.sp_maintplan_delete_log NULL, NULL, @expiredDT

上面脚本中使用到一个日期格式转换函数，代码为：

/****** Object:  UserDefinedFunction [dbo].[ufn_FormatDate]    Script Date: 2015/11/24 19:40:45 ******/
DROP FUNCTION [dbo].[ufn_FormatDate]
GO


/****** Object:  UserDefinedFunction [dbo].[ufn_FormatDate]    Script Date: 2015/11/24 19:40:45 ******/
SET ANSI_NULLS ON
GO


SET QUOTED_IDENTIFIER ON
GO


--====================================
--将时间转换成制定格式的字符串
CREATE FUNCTION [dbo].[ufn_FormatDate]
   (
     @Datetime DATETIME ,
     @FormatMask VARCHAR(32)
   )
RETURNS VARCHAR(32)
AS
   BEGIN


       DECLARE @StringDate VARCHAR(32)


       SET @StringDate = @FormatMask


       IF ( CHARINDEX(‘YYYY‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘YYYY‘,
                                     DATENAME(YY, @Datetime))


       IF ( CHARINDEX(‘YY‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘YY‘,
                                     RIGHT(DATENAME(YY, @Datetime), 2))
       IF ( CHARINDEX(‘MM‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘MM‘,
                                     RIGHT(‘0‘ + CONVERT(VARCHAR, DATEPART(MM,
                                                             @Datetime)), 2))




       IF ( CHARINDEX(‘DD‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘DD‘,
                                     RIGHT(‘0‘ + DATENAME(DD, @Datetime), 2))




       IF ( CHARINDEX(‘HH‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘HH‘,
                                     RIGHT(‘0‘ + DATENAME(HH, @Datetime), 2))


       IF ( CHARINDEX(‘mm‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘mm‘,
                                     RIGHT(‘0‘ + DATENAME(mm, @Datetime), 2))


       IF ( CHARINDEX(‘ss‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘ss‘,
                                     RIGHT(‘0‘ + DATENAME(ss, @Datetime), 2))


       IF ( CHARINDEX(‘ms‘, @StringDate) > 0 )
           SET @StringDate = REPLACE(@StringDate, ‘ms‘,
                                     RIGHT(‘0‘ + DATENAME(ms, @Datetime), 2))


       RETURN @StringDate


   END
--====================================


GO

没多少技术含量，厚脸拿出来供初学者学习下！

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SQLSERVER--定期清理维护作业的历史记录

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