清除或收缩数据库日志代码,MSSQL代码库,德仔网

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【MSSQL】清除或收缩数据库日志

作者:mh942408056 / 发布于2014/4/11/ 701

MSSQL清除或收缩数据库日志

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


USE   Marias       -- 要操作的数据库名
SELECT @LogicalFileName = 'Marias_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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