set nocount on
declare @logicalfilename sysname,@maxminutes int,@newsize int
use grades -- 要操作的數(shù)據(jù)庫(kù)名
select @logicalfilename = 'grades_log', -- 日志文件名
@maxminutes = 10, -- limit on time allowed to wrap log.
@newsize = 1 -- 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
菜鳥學(xué)堂：
