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简单实现Standby Sql Server数据库

 2007-05-17 09:37:05 来源:WEB开发网   
核心提示: 备份环境下的服务器在[控制面板]->[任务计划]里添加一个每天0:05分开始,每20分钟执行一次的xcopy局域网上备份目录下最新文件的任务,简单实现Standby Sql Server数据库(2),直到23:59分,xcopy \192.168.0.1db_test_backup

备份环境下的服务器在[控制面板]->[任务计划]里添加一个每天0:05分开始,每20分钟执行一次的xcopy局域网上备份目录下最新文件的任务,直到23:59分。

xcopy \192.168.0.1db_test_backup F:ackup_datadb_test /c /y /d /s

备份服务器上SQL Server根据复制过来的备份文件,也每天0:10分开始,每20分钟执行一次由旧到新,逐一恢复数据库的作业(调用我改写的过程sp_RestoreDir实现);

另外还有一个删除备份服务器两天前备份文件的作业(调用我写的过程p_delete_db_test_backup实现),避免备份硬盘扇区被装满。

过程sp_RestoreDir的源代码:

if exists (
select *
from dbo.sysobjects
where id = object_id(N'[dbo].[sp_RestoreDir]')
and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[sp_RestoreDir]
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
/***************************************************************************************/
-- 目  的: 根据某个目录下某个数据库的备份文件(*.trn或*.bak都可以)还原数据库.
--      配合xcopy命令,可以在另一台备份机器上实现standby SQL Server数据库.
--
-- 输入参数: @restoreFromDir - 存放*.trn或*.bak数据库备份文件的目录
--     @restoreToDataDir - 数据库数据文件将要还原的目录
--     @restoreToLogDir - 数据库日志文件将要还原的目录, 如果为空,
--     日志文件和数据文件目录相同
--
-- Written By:  Chris Gallelli -- 8/22/2003
-- Modified By:  Bruce Canaday -- 11/04/2003
--      http://www.sqlservercentral.com/scripts/contributions/962.asp
-- Modified By:  maggiefengyu@tom.com --- 02/23/2005
--
-- 调用举例: exec sp_RestoreDir 'F:ackup_datadb_test', 'E:sqlserver_datadb_test'
/***************************************************************************************/
CREATE  proc sp_RestoreDir
    @restoreFromDir varchar(255),
    @restoreToDataDir varchar(255)= null,
    @restoreToLogDir varchar(255) = null
as
--If a directory for the Log file is not supplied then use the data directory
If @restoreToLogDir is null
  set @restoreToLogDir = @restoreToDataDir
set nocount on
declare @filename     varchar(40),
  @cmd       varchar(500),
    @DataName     varchar (255),
  @LogName     varchar (255),
    @LogicalName   varchar(255),
  @PhysicalName   varchar(255),
  @Type       varchar(20),
  @FileGroupName  varchar(255),
  @Size       varchar(20),
  @MaxSize     varchar(20),
  @restoreToDir   varchar(255),
  @DBName      varchar(255),
    @PhysicalFileName varchar(255),
    @i_exist   int
create table #dirList (id [int] IDENTITY (1, 1) NOT NULL , filename varchar(100))
create table #filelist (LogicalName varchar(255), PhysicalName varchar(255),
Type varchar(20), FileGroupName varchar(255), Size varchar(20), MaxSize varchar(20) )
--Get the list of database backups that are in the restoreFromDir directory order by date desc
  select @cmd = 'dir /b /o-d /o-g "' +@restoreFromDir+ '"'
set @i_exist=0
insert into #dirList(filename) exec master..xp_cmdshell @cmd 
-- 找到备份目录下次新的2个文件名, 不处理最新的, 避免最新备份好的物理文件没有完全复制成功
select filename from #dirList where id>1 and id<8 order by id desc
begin 
   declare BakFile_csr cursor for
    select filename from #dirList where id>1 and id<8 order by id desc
end
open BakFile_csr
fetch BakFile_csr into @filename
while @@fetch_status = 0
  begin
-- 判断恢复日志表restore_log存在否,不存在则创建表
    if not exists (
        select *
        from dbo.sysobjects
        where id = object_id('restore_log')
        and OBJECTPROPERTY(id, N'IsUserTable') = 1)
  begin
    create table restore_log (filename varchar(128),dt datetime default getdate())
  end
-- 判断此备份文件有无在恢复日志表里记录过?
    select @i_exist=count(0) from restore_log where filename=@filename
    if @i_exist=0
    begin
-- 根据备份目录下的物理文件名, 找到对应的逻辑名等参数
    select @cmd = "RESTORE FILELISTONLY FROM disk = '"
    + @restoreFromDir + "" + @filename + "'"
      insert #filelist exec ( @cmd )
      
--     select * from #filelist
    if right(@filename,3)='TRN'
    begin
      select @dbName = left(@filename,datalength(@filename)
      - patindex('%_golt_%',reverse(@filename))-5)
      select @cmd = "RESTORE Log " + @dbName +
    " FROM DISK = '" + @restoreFromDir + "" + @filename +
    "' WITH STANDBY='"+@restoreToDataDir+"UNDO_"+@filename+".DAT ',"
      print ''
      print '--RESTORING Log ' + @dbName
    end
    if right(@filename,3)='BAK'
    begin
     select @dbName = left(@filename,datalength(@filename)
     - patindex('%_bd_%',reverse(@filename))-3)
       select @cmd = "RESTORE DATABASE " + @dbName +
    " FROM DISK = '" + @restoreFromDir + "" + @filename +
    "' WITH NORECOVERY ,"
       print ''
     print '--RESTORING DATABASE ' + @dbName
    end  
-- 找到数据库逻辑和物理文件名称之间的对应关系
      declare DataFileCursor cursor for 
    select LogicalName, PhysicalName, Type, FileGroupName, Size, MaxSize
    from #filelist
      open DataFileCursor
      fetch DataFileCursor into @LogicalName, @PhysicalName, @Type,
      @FileGroupName, @Size, @MaxSize
      while @@fetch_status = 0
     begin
         -- RESTORE with MOVE option
        select @PhysicalFileName = reverse(substring(
        reverse(rtrim(@PhysicalName)),1,patindex('%\%',
        reverse(rtrim(@PhysicalName)))-1 ))
      select @restoreToDir = @restoreToDataDir
        select @cmd = @cmd +
          " MOVE '" + @LogicalName + "' TO '" +
              @restoreToDir + "" + @PhysicalFileName + "', "
       fetch DataFileCursor into @LogicalName, @PhysicalName,
       @Type, @FileGroupName, @Size, @MaxSize
     end -- DataFileCursor loop
  close DataFileCursor
    deallocate DataFileCursor
      select @cmd = @cmd + ' REPLACE'
     print @cmd     
     print ''
     
     select @cmd
     
      EXEC (@cmd)
  IF @@ERROR=0
  BEGIN
-- 如果恢复成功,记恢复操作日志
    delete from restore_log where dt<getdate()-2
      insert into restore_log (filename) values (@filename)
    END
      truncate table #filelist
      
    end -- @i_exist=0
   fetch BakFile_csr into @filename
  end -- BakFile_csr loop
close BakFile_csr
deallocate BakFile_csr
drop table #dirList
return
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO

Tags:简单 实现 Standby

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