從網上整理的Sql 2005減少日誌文件的方法

方法一：粗暴型：

1.进入企业管理器，选中数据库，

2、所有任务->分离数据库

3、到数据库文件的存放目录，将***_log.LDF文件删除，你怕S的话可以拷出去

4、企业管理器->附加数据库，选mdf，这个时候你会看见日志文件这项是一个叉，不要紧继续，此时数据库就会提示你该数据库无日志是否创建一个新的，确定就是了。

5、记得数据库重新附加后用户要重新设置一下

方法二：一般型

建立作业，每天运行一次以下代码，缩小日志文件

backup log xxx with NO_LOG

backup log xxx with TRUNCATE_ONLY

DBCC SHRINKDATABASE(xxx)

方法三：持久型

修改数据库属性，恢复模式选为“简单”

修改日志文件属性，自动增长设为1MB，不设最大大小

执行收缩数据库

--SQL语句的设置方式:

alter database 数据库名 modify file(name=逻辑文件名,maxsize=20)

方法四:如果我们以前没有注意,现在日志已经很大, 但是日志对我们又没有什么用的话,此时可以使用两种方法来减少日志文件所占有的空间

1.直接删除日志文件

exec sp_helpdb 'pubs'

Name filename

pubs d:"Program Files"Microsoft SQL Server"MSSQL"data"pubs.mdf

pubs_log d:"Program Files"Microsoft SQL Server"MSSQL"data"pubs_log.ldf

EXEC SP_DETACH_DB 'PUBS'

EXEC MASTER.DBO.XP_CMDSHELL 'DEL "d:"Program Files"Microsoft SQL Server"MSSQL"data"pubs_log.ldf"'

EXEC MASTER.DBO.XP_CMDSHELL 'DIR "d:"Program Files"Microsoft SQL Server"MSSQL"data"PUBS*.LDF"'

THE RESULT IS:

File Not Found

EXEC SP_ATTACH_SINGLE_FILE_DB N'PUBS',

@PHYSNAME=N'd:"Program Files"Microsoft SQL Server"MSSQL"data"pubs.mdf'

SQL SERVER PRINT THE FOLLOW MESSAGE:

Device activation error. The physical file name 'd:"Program Files"Microsoft SQL Server"MSSQL"data"pubs_log.ldf' may be incorrect.

New log file 'd:"Program Files"Microsoft SQL Server"MSSQL"data"PUBS_log.LDF' was created.

NOW YOU CAN USE PUBS NORMALLY.

2.截断日志,然后收缩日志文件.可以把这引步骤放在一个存储过程中,请先执行下面的存储过程创建语句:

CREATE PROC Up_shrinkfile

@LogicalFileName sysname,---- Use sp_helpfile to identify the logical filename that you want to shrink.

@MaxMinutes INT,--Limit on time allowed to wrap log.

@NewSize INT -- in MB

as

Begin

DECLARE @OriginalSize int

SELECT @OriginalSize = size -- in 8K pages

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)

-- Wrap log and truncate it.

DECLARE

@StartTime DATETIME,

@TruncLog VARCHAR(255)

SELECT @StartTime = GETDATE(),

@TruncLog = 'BACKUP LOG ['+ db_name() + '] WITH TRUNCATE_ONLY'

-- Try an initial shrink.

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) -- the log has not shrunk

AND (@OriginalSize * 8 /1024) > @NewSize -- The value passed in for new size is smaller than the current size.

BEGIN -- Outer loop.

WAITFOR DELAY '00:00:30'

EXEC (@TruncLog) -- See if a trunc of the log shrinks it.

END -- outer loop

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

PRINT '*** Perform a full database backup ***'

SET NOCOUNT OFF

End

然后执行此存储过程,如:

exec sp_helpdb 'pubs'

EXEC Up_shrinkfile 'pubs_log',10,1