清除数据库的日志

SET NOCOUNT ON

DECLARE @LogicalFileName sysname,

@MaxMinutes INT,

@NewSize INT

USE cms -- 要操作的数据库名

SELECT @LogicalFileName = \'cms_log\', -- 日志文件名

@MaxMinutes = 10, -- Limit on time allowed to wrap log.

@NewSize = 100 -- 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

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