this is a extra element for clear the floated element
rman备份,未用catalog,控制文件丢失的解决(2)
  • 12/31
  • 2008
备份恢复 | Oracle 1515 次查看
  PROCEDURE restoreControlfileTo(cfname IN varchar2);

  -- This copies the controlfile from the backup set to an operating system

  -- file. If the database is mounted, the name must NOT match any of the

  -- current controlfiles.

  --

  -- Input parameters:

  -- cfname

  -- Name of file to create or overwrite with the controlfile from the

  -- backup set.

  PROCEDURE restoreDataFileTo( dfnumber IN binary_integer

  ,toname IN varchar2 default NULL);

  --

  -- restoreDataFileTo creates the output file from a complete backup in the

  -- backup set.

  如果您有兴趣可以去阅读一下这两个文件的注释说明.

  我们首先尝试恢复控制文件:

  SQL>startup force nomount;

  SQL> DECLARE

  2 devtype varchar2(256);

  3 done boolean;

  4 BEGIN

  5 devtype:=sys.dbms_backup_restore.deviceAllocate(type=>'',ident=>'T1');

  6 sys.dbms_backup_restore.restoreSetDatafile;

  7 sys.dbms_backup_restore.restoreControlfileTo(cfname=>'d:\oracle\Control01.ctl');

  8 sys.dbms_backup_restore.restoreBackupPiece(done=>done,handle=>'D:\KDE\DEMO_01FR79OT_1_1.DBF', params=>null);

  9 sys.dbms_backup_restore.deviceDeallocate;

  10 END;

  11 /

  PL/SQL procedure successfully completed.

  OK,控制文件恢复完成.对以上内容的解释:

  第五行 分配一个device channel,因为使用的操作系统文件,所以这里为空,如果是从磁带上恢复要用

  "sbt_tape";

  第六行 指明开始restore ;

  第七行 指出待恢复文件目标存储位置;

  第八行 从哪个备份片中恢复;

  第九行 释放设备通道.

  不妨对以上操作的结果验证一下:

  SQL> host dir d:\oracle

  Volume in drive D is DATA

  Volume Serial Number is DC79-57F8

  Directory of d:\oracle

  07/18/2004 09:08 PM <DIR> .

  07/18/2004 09:08 PM <DIR> ..

  06/08/2004 03:21 PM <DIR> admin

  07/18/2004 09:08 PM 1,871,872 CONTROL01.CTL

  07/16/2004 11:27 AM <DIR> ORA92

  07/18/2004 09:02 PM <DIR> oradata

  这样,我们成功的restore了控制文件 .如果控制文件在Full备份之后单独做的,接下来关掉实例,拷贝控制文件到具体位置,然后rman 执行restore database;即可。

  可是,我们这里的情况有些不同.

  视丢失文件的情况而定,继续进行如下的恢复操作:

  代码:--------------------------------------------------------------------------------

  SQL> DECLARE

  2 devtype varchar2(256);

  3 done boolean;

  4 BEGIN

  5 devtype:=sys.dbms_backup_restore.deviceAllocate (type=>'',ident=>'t1');

  6 sys.dbms_backup_restore.restoreSetDatafile;

  7 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>01,toname=>'

  d:\oracle\oradata\demo\SYSTEM01.DBF');

  8 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>02,toname=>'

  d:\oracle\oradata\demo\UNDOTBS01.DBF');

  9 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>03,toname=>'

  d:\oracle\oradata\demo\DRSYS01.DBF');

  10 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>04,toname=>'

  d:\oracle\oradata\demo\EXAMPLE01.DBF');

  11 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>05,toname=>'

  d:\oracle\oradata\demo\INDX01.DBF');

  12 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>06,toname=>'

  d:\oracle\oradata\demo\ODM01.DBF');

  13 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>07,toname=>'

  d:\oracle\oradata\demo\TOOLS01.DBF');

  14 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>08,toname=>'

  d:\oracle\oradata\demo\USERS01.DBF');

  15 sys.dbms_backup_restore.restoreDatafileTo(dfnumber=>09,toname=>'

  d:\oracle\oradata\demo\XDB01.DBF');

  16 sys.dbms_backup_restore.restoreBackupPiece(done=>done,handle=>'

  D:\KDE\DEMO_01FR79OT_1_1.DBF', params=>null);

  17 sys.dbms_backup_restore.deviceDeallocate;

  18 END;

  19 /

  PL/SQL procedure successfully completed.

  --我们的情形是所有的数据文件都丢失了,那就如法炮制 ...........

  --文件对应编号来自前面全备份时候的屏幕输出内容.所以,在备份的时候保留操作Log是个很好的习惯.

  SQL> startup force mount;

  ORACLE instance started.

  Total System Global Area 152115804 bytes

  Fixed Size 453212 bytes

  Variable Size 100663296 bytes

  Database Buffers 50331648 bytes

  Redo Buffers 667648 bytes

  Database mounted.

  SQL> Recover database using backup controlfile until cancel ;

  ORA-00279: change 243854 generated at 07/18/2004 20:57:03 needed for thread 1

  ORA-00289: suggestion : D:\KDE\ARC00002.001

  ORA-00280: change 243854 for thread 1 is in sequence #2

  Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

  D:\KDE\ARC00002.001

  ORA-00279: change 244089 generated at 07/18/2004 20:58:18 needed for thread 1

  ORA-00289: suggestion : D:\KDE\ARC00003.001

  ORA-00280: change 244089 for thread 1 is in sequence #3

  ORA-00278: log file 'D:\KDE\ARC00002.001' no longer needed for this recovery

  Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

  cancel

  Media recovery cancelled.

  SQL> alter database open resetlogs;

  Database altered.

  最后,不得不resetlogs .

  然后,打扫战场,马上进行数据库的全备份。如果您是DBA的话,应该进一步制定并完善备份计划.亡羊补牢,为时未晚。

  总结一下

  1 控制文件在备份中意义重大,建议每次对其单独备份,如果数据库版本允许的话,应该设置为控制文件自动备 份。同时应该尽可能地增大CONTROL_FILE_RECORD_KEEP_TIME这个初始化参数的值。以便备份信息能更长时间的保留

  2 应该制定比较完善的备份计划,否则备份计划一旦出现缺口,将可能给系统带来灾难.记住, "可能出错的地方一定会出错".

  3 熟悉RMAN内部备份机制,对DBMS_BACKUP_RESTORE的用法有一定的掌握在关键时侯很有帮助.

  4 备份脚本应该对Log重定向并保存.以便在出错的查找有用信息.

  参考资料:

  RMAN Recovery Without Recovery Catalog or Controlfiles by Bonnie Bizzarodbmsbkrs.sql 和 prvtbkrs.plb 文件说明注释(可在你的系统 $ORACLE_HOME/rdbms/admin/中找到.)

  相关链接:

  本文的更多讨论,请参考这里:

  http://www.itpub.net/244345.html

  DBA工作备忘录之二: Exp出错的一个案例

  http://www.itpub.net/showthread.php?s=&threadid=238819

  DBA工作备忘录之一:用events 跟踪解决不能创建物化试图一例

  http://www.dbanotes.nethttp://oracle.chinaitlab.com/Oracle-Case-of-10046_I.htm

  原文出处

  <a href="http://www.dbanotes.nethttp://oracle.chinaitlab.com/Rman_nocatalog_lost_controlfile_howto.htm">

  http://www.dbanotes.net/Rman_nocatalog_lost_controlfile_howto.htm</a>