缩小SQL SERVER日志文件

找到下面的代码，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(数据库名，日志文件名，和目标日志文件的大小)，运行即可!

set nocount on
declare @logicalfilename sysname,
@maxminutes int,
@newsize int

use gfcms -- 要操作的数据库名
select @logicalfilename = 'gfcms_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)，注意此大小必须小于实际文件大小

-- setup / initialize
--获取原始文件大小
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'

exec (@trunclog)--把log中能够shrink的transaction的log标记为可以清除
dbcc shrinkfile (@logicalfilename, @newsize)--shrink文件

-- 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