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set nocount on
declare @logicalfilename sysname,
@maxminutes int,
@newsize int
use “abc”– 要操作的数据库名
select @logicalfilename = abc_log, — 日志文件名
@maxminutes = 10, — limit on time allowed to wrap log.
@newsize = 500 — 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
