Sql Server 2005 日志文件清除，收缩

清除日志：
--以下代码未经验证
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)