SET NOCOUNT ONDECLARE @LogicalFileName sysname,        @MaxMinutes INT,        @NewSize INTUSE     Marias             -- 要操作的數據庫名SELECT  @LogicalFileName = 'Marias_log',  -- 日志文件名@MaxMinutes = 10,               -- Limit on time allowed to wrap log.        @NewSize = 100                  -- 你想設定的日志文件的大小(M)-- Setup / initializeDECLARE @OriginalSize intSELECT @OriginalSize = size   FROM sysfiles  WHERE name = @LogicalFileNameSELECT 'Original Size of ' + db_name() + ' LOG is ' +         CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' +         CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB'  FROM sysfiles  WHERE 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 expired      AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)        AND (@OriginalSize * 8 /1024) > @NewSize    BEGIN -- Outer loop.    SELECT @Counter = 0    WHILE  ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))      BEGIN -- update        INSERT DummyTrans VALUES ('Fill Log')          DELETE DummyTrans        SELECT @Counter = @Counter + 1      END       EXEC (@TruncLog)    END   SELECT 'Final Size of ' + db_name() + ' LOG is ' +        CONVERT(VARCHAR(30),size) + ' 8K pages or ' +         CONVERT(VARCHAR(30),(size*8/1024)) + 'MB'  FROM sysfiles   WHERE name = @LogicalFileNameDROP TABLE DummyTransSET NOCOUNT OFF