SQL Server清除日誌語句

sql

1 --清除日誌：

2 declare @logicalfilename sysname,
3 @maxminutes int,
4 @newsize int
5 use database --******** 要操作的資料庫名********
6 select @logicalfilename = '
database_log
', -- ********日誌檔名********
7 @maxminutes = 10, -- limit on time allowed to wrap log.
8 @newsize = 20 -- ********你想設定的日誌檔案的大小(m)********
9 -- setup / initialize
10 declare @originalsize int
11 select @originalsize = size 
12 from sysfiles
13 where name = @logicalfilename
14 select '
original size of 
' + db_name() + '
log is 
' + 
15 convert(varchar(30),@originalsize) + '
8k pages or 
' + 
16 convert(varchar(30),(@originalsize*8/1024)) + 'mb'
17 from sysfiles
18 where name = @logicalfilename
19 create table dummytrans(dummycolumn char (8000) not null)
20 declare @counter int,
21 @starttime datetime,
22 @trunclog varchar(255)
23 select @starttime = getdate(),
24 @trunclog = '
backup log 
' + db_name() + '
with truncate_only
'25 dbcc shrinkfile (@logicalfilename, @newsize)
26 exec (@trunclog)
27 -- wrap the log if necessary.
28 while @maxminutes > datediff (mi, @starttime, getdate()) -- time 
29 and @originalsize = (select size from sysfiles where name = 
30 @logicalfilename) and (@originalsize * 8 /1024) > @newsize 
31 begin -- outer loop.
32 select @counter = 0
33 while ((@counter < @originalsize / 16) and (@counter < 50000))
34 begin -- update
35 insert dummytrans values ('
fill log
') 
36 delete dummytrans
37 select @counter = @counter + 1
38 end 
39 exec (@trunclog) 
40 end 
41 select '
final size of 
' + db_name() + '
log is 
' +42 convert(varchar(30),size) + '
8k pages or 
' + 
43 convert(varchar(30),(size*8/1024)) + 'mb'
44 from sysfiles 
45 where name = @logicalfilename
46 drop table dummytrans
47 set nocount off

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