很多独立服务器客户反馈数据库日志文件过大，严重浪费磁盘资源，数据库实际大小为600M, 日志文件实际大小为33M, 但日志文件占用空间为2.8G!!!
我们及时反馈给我们的研发部门，他们写了一个脚本，就可以将日志文件缩小到自己想要的大小了。把代码COPY到查询分析器里，，然后修改其中的3个参数(红色字体部分)，运行即可(测试通过，请独立服务器客户测试)
-----
SET NOCOUNT ON

DECLARE @LogicalFileName sysname,

@MaxMinutes INT,

@NewSize INT

USE   data_db            -- 要操作的数据库名

SELECT  @LogicalFileName = 'data_db_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

以上代码用T-SQL语言实现。