SQL Server日志清除两种方法

SET NOCOUNT ONDECLARE @LogicalFileName sysname,@MaxMinutes INT,@NewSize INTUSE tablename -- 要操作的数据库名SELECT @LogicalFileName = ’tablename_log’, -- 日志文件名@MaxMinutes = 10, -- Limit on time allowed to wrap log.@NewSize = 1 -- 你想设定的日志文件的大小(M)-- Setup / initializeDECLARE @OriginalSize intSELECT @OriginalSize = sizeFROM sysfilesWHERE name = @LogicalFileNameSELECT ’Original Size of ’ + db_name() + ’ LOG is ’ +CONVERT(VARCHAR(30),@OriginalSize) + ’ 8K pages or ’ +CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + ’MB’FROM sysfilesWHERE name = @LogicalFileNameCREATE TABLE DummyTrans(DummyColumn char (8000) not null)DECLARE @Counter INT,@StartTime DATETIME,@TruncLog VARCHAR(255)SELECT @StartTime = GETDATE(),@TruncLog = ’BACKUP LOG ’ + db_name()      + ’ WITH TRUNCATE_ONLY’DBCC SHRINKFILE (@LogicalFileName, @NewSize)EXEC (@TruncLog)-- Wrap the log if necessary.WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE())     -- time has not expiredAND @OriginalSize = (SELECT size FROM     sysfiles WHERE name = @LogicalFileName)AND (@OriginalSize * 8 /1024) > @NewSizeBEGIN -- Outer loop.SELECT @Counter = 0WHILE ((@Counter < @OriginalSize / 16) AND            (@Counter < 50000))BEGIN -- updateINSERT DummyTrans VALUES (’Fill Log’)DELETE DummyTransSELECT @Counter = @Counter + 1ENDEXEC (@TruncLog)ENDSELECT ’Final Size of ’ + db_name() + ’ LOG is ’ +CONVERT(VARCHAR(30),size) + ’ 8K pages or ’ +CONVERT(VARCHAR(30),(size*8/1024)) + ’MB’FROM sysfilesWHERE name = @LogicalFileNameDROP TABLE DummyTransSET NOCOUNT OFF