SET NOCOUNT ON 　　DECLARE @LogicalFileName sysname, 　　@MaxMinutes INT, 　　@NewSize INT 　　USE 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 / initialize 　　DECLARE @OriginalSize int 　　SELECT @OriginalSize = size 　　FROM sysfiles 　　WHERE name = @LogicalFileName 　　SELECT '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 = @LogicalFileName 　　CREATE 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 = @LogicalFileName 　　DROP TABLE DummyTrans 　　SET NOCOUNT OFF