SET NOCOUNT ON 
DECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT 

USE {DBName ex HRMS} -- 要操作的資料庫名 
SELECT 
  @LogicalFileName = '{Log file name ex HRMS_Log}', -- 日誌文件名 
  @MaxMinutes = 10, -- Limit on time allowed to wrap log. (M)
  @NewSize = 1 -- 你想設定的日誌文件的大小(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