清除日志和收缩日志代码,MSSQL代码库,德仔网

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【MSSQL】清除日志和收缩日志

作者:mh942408056 / 发布于2014/4/11/ 956

--清除日志：
DECLARE @LogicalFileName sysname,
    @MaxMinutes INT,
    @NewSize INT
USE   szwzcheck       -- 要操作的数据库名
SELECT @LogicalFileName = 'szwzcheck_Log', -- 日志文件名
@MaxMinutes = 10,        -- Limit on time allowed to wrap log.
    @NewSize = 20         -- 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
   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

--把szwzcheck换成你数据库的名字即可，在查询分析器里面运行。

--收缩日志：企业管理器--所有任务--收缩数据库--文件--选日志文件收缩

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　清除日志　

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