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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