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压缩SQLServer数据库日志的一个存储过程

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Release: 2016-06-07 15:26:05
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use master --注意,此存储过程要建在master数据库中 go if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_compdb]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) drop procedure [dbo].[p_compdb] GO create proc p_compdb @dbna

use master  --注意,此存储过程要建在master数据库中
go

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_compdb]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_compdb]
GO

create proc p_compdb
@dbname sysname,   --要压缩的数据库名
@bkdatabase bit=1,   --因为分离日志的步骤中,可能会损坏数据库,所以你可以选择是否自动数据库
@bkfname nvarchar(260)='' --备份的文件名,如果不指定,自动备份到默认备份目录,备份文件名为:数据库名+日期时间
as
--1.清空日志
exec('DUMP TRANSACTION ['+@dbname+'] WITH  NO_LOG')

--2.截断事务日志:
exec('BACKUP LOG ['+@dbname+'] WITH NO_LOG')

--3.收缩数据库文件(如果不压缩,数据库的文件不会减小
exec('DBCC SHRINKDATABASE(['+@dbname+'])')

--4.设置自动收缩
exec('EXEC sp_dboption '''+@dbname+''',''autoshrink'',''TRUE''')

--后面的步骤有一定危险,你可以可以选择是否应该这些步骤
--5.分离数据库
if @bkdatabase=1
begin
 if isnull(@bkfname,'')=''
  set @bkfname=@dbname+'_'+convert(varchar,getdate(),112)
   +replace(convert(varchar,getdate(),108),':','')
 select 提示信息='备份数据库到SQL 默认备份目录,备份文件名:'+@bkfname
 exec('backup database ['+@dbname+'] to disk='''+@bkfname+'''')
end

--进行分离处理
create table #t(fname nvarchar(260),type int)
exec('insert into #t select filename,type=status&0x40 from ['+@dbname+']..sysfiles')
exec('sp_detach_db '''+@dbname+'''')

--删除日志文件
declare @fname nvarchar(260),@s varchar(8000)
declare tb cursor local for select fname from #t where type=64
open tb
fetch next from tb into @fname
while @@fetch_status=0
begin
 set @s='del "'+rtrim(@fname)+'"'
 exec master..xp_cmdshell @s,no_output
 fetch next from tb into @fname
end
close tb
deallocate tb

--附加数据库
set @s=''
declare tb cursor local for select fname from #t where type=0
open tb
fetch next from tb into @fname
while @@fetch_status=0
begin
 set @s=@s+','''+rtrim(@fname)+''''
 fetch next from tb into @fname
end
close tb
deallocate tb
exec('sp_attach_single_file_db '''+@dbname+''''+@s)
go

/*--调用示例
 exec p_compdb 'test'
--*/

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