Backupsets

Question

Hi All,
I have confusion whether is there any way in Oracle 9i, through which we can recover our database using RMAN , when we have only backupsets available nothing else.
Thanks in Advance
Regards
Harpreet Singh

Answer 1

How do you lose all of your control files?
If you are using RMAN, at least know what the terms mean. Your repository was in the control files, not in a recovery catalog.
The only thing you can do right now is to create new control files. Your instance has been terminated, or the database will not open. If the instance was running, it crashed when at least one of the CFs was lost. If the instance wasn't running, you will not be able to mount the database.
SQL> startup nomount
ORACLE instance started.
Total System Global Area  289406976 bytes
Fixed Size                  1290184 bytes
Variable Size             113246264 bytes
Database Buffers          167772160 bytes
Redo Buffers                7098368 bytes
SQL> alter database mount;
alter database mount
ERROR at line 1:
ORA-00205: error in identifying control file, check alert log for more infoDo you know where the backupset(s) is located? Do you know the DBID of your database? If you backed up your control file with RMAN, you may have a file with the DBID as part of the filename. If you have that, you are rocking. If not, you can create a controlfile by scraping the filenames off of your file system.
     CREATE CONTROLFILE REUSE DATABASE "DB10" NORESETLOGS NOARCHIVELOG
         MAXLOGFILES 50
         MAXLOGMEMBERS 3
        MAXDATAFILES 300
        MAXINSTANCES 8
        MAXLOGHISTORY 500
     LOGFILE
            GROUP 7 'D:\oracle\product\10.2.0\oradata\db10\redo07.log'  SIZE 5M,
            GROUP 8 'D:\oracle\product\10.2.0\oradata\db10\redo08.log'  SIZE 5M,
            GROUP 9 'D:\oracle\product\10.2.0\oradata\db10\redo09.log'  SIZE 5M
     DATAFILE
          'D:\oracle\product\10.2.0\oradata\db10\users01.dbf' SIZE 70400K,
          'D:\oracle\product\10.2.0\oradata\db10\undotbs01.dbf' SIZE 128000K,
          'D:\oracle\product\10.2.0\oradata\db10\system01.dbf' SIZE 614400K,
          'D:\oracle\product\10.2.0\oradata\db10\sysaux01.dbf' SIZE 593920K,
          'D:\oracle\product\10.2.0\oradata\db10\example01.dbf' SIZE 174080K;You may get block size errors, so take the expected number of blocks times the db_block size and divide by 1024. You may have to guess the redo log group numbers too.
When this is successful, the database will be mounted. You can open it from here. Immediately take a backup, to include control file. You will also need to create a new temp tablespace. Piece of cake, yes?