也談如何縮小SQL SERVER日志文件

2024-08-31 00:49:06

字體：大中小

供稿：網(wǎng)友

前幾天也碰到日志文件過大的問題，數(shù)據(jù)庫(kù)實(shí)際大小為600m, 日志文件實(shí)際大小為33m, 但日志文件占用空間為2.8g!!!
試了多種方式，shirnk database， truncate log file, 都沒辦法將文件縮小。無論如何，這應(yīng)該算sql server的一個(gè)bug吧。

后來找到下面的代碼，就可以將日志文件縮小到自己想要的大小了。把代碼copy到查詢分析器里，，然后修改其中的3個(gè)參數(shù)(數(shù)據(jù)庫(kù)名，日志文件名，和目標(biāo)日志文件的大小)，運(yùn)行即可(我已經(jīng)用過多次了)
-----
set nocount on
declare @logicalfilename sysname,
@maxminutes int,
@newsize int

use     marias             -- 要操作的數(shù)據(jù)庫(kù)名
select @logicalfilename = 'marias_log', -- 日志文件名
@maxminutes = 10,               -- limit on time allowed to wrap log.
        @newsize = 100                  -- 你想設(shè)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