清除日志：

复制代码 代码如下:

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。

有全角的空格(为了显示好看),你自己把他换一下.

查字典教程网编辑注：

一般情况下，用下面的语句更简单

复制代码 代码如下:

DUMP TRANSACTION [jb51] WITH NO_LOG

BACKUP LOG [jb51] WITH NO_LOG

DBCC SHRINKDATABASE([jb51])

其中jb51就是你要处理的数据库名。