SQLServer日志清除的两种方法教程简介

USE     tablename             -- 要把持的数据库名
SELECT  @LogicalFileName = 'tablename_log',  -- 日志文件名
@MaxMinutes = 10,               -- Limit on time allowed to wrap log.
        @NewSize = 1                  -- 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