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在SQL Server 2000查询分析器里面收缩数据库日志


  操作环境:Windows 2000 Advanced Server 英文版 + sp4、SQL Server 2000英文企业版+sp3
  
  任务描述:
  
  我有一个数据库,名称为:Cisi。它的数据库日志的名称为:Cisi_log
  这个日志的大小为1082M,现在我要把它截断,令其收缩为10M
  
  操作如下:
  
  在查询分析器里面,用sa登录,然后执行下列语句:
  
  -- Prog: Xinsoft
  -- Time: 2005-03-26 10:34
  
  SET NOCOUNT ON
  DECLARE @LogicalFileName sysname,
  @MaxMinutes INT,
  @NewSize INT
  
  USE    Cisi          -- 要操作的数据库名
  SELECT @LogicalFileName = 'Cisi_log', -- 日志文件名
  @MaxMinutes = 10,           -- Limit on time allowed to wrap log.
  @NewSize = 10             -- 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
  --Drop TABLE DummyTrans
  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
  
  执行结果:
  
  Original Size of Cisi LOG is 138600 8K pages or 1082MB
  Final Size of Cisi LOG is 1303 8K pages or 10MB
  
  数据库日志已成功地收缩为10M。
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