RE: Lost ofall redo logs

Joe:

I understand what you say.. But the situation is very bad. He does **NOT** have ANY backups.

KG

-----Original Message-----
Sent: Thursday, September 19, 2002 4:43 AM To: Multiple recipients of list ORACLE-L

As I stated earlier, right out of the user managed recover docs(loss of all online redo logs):

you'll need to do the restore from backup, using what archivelogs available roll forward to point of last archived log and open resetlogs <--- the abbreviated version.

joe

      Recovering After the Loss of All Members of an Online Redo Log Group

If a media failure damages all members of an online redo log group, then different scenarios can occur depending on the type of online redo log group affected by the failure and the archiving mode of the database.

If the damaged log group is inactive, then it is not needed for crash recovery; if it is active, then it is needed for crash recovery.

*If the group is . . .* *Then . . .* *And you should . . .*

Inactive

It is not needed for crash recovery

Clear the archived or unarchived group.

Active

It is needed for crash recovery

Attempt to issue a checkpoint and clear the log; if impossible, then you must restore a backup and perform incomplete recovery up to the most recent available log.

Current

It is the log that Oracle is currently writing to

Attempt to clear the log; if impossible, then you must restore a backup and perform incomplete recovery up to the most recent available log.

Your first task is to determine whether the damaged group is active or inactive.

        *Loss of Multiple Redo Log Groups*

If you have lost multiple groups of the online redo log, then use the recovery method for the most difficult log to recover. The order of difficulty, from most difficult to least difficult, follows:

1. The current online redo log
2. An active online redo log
3. An unarchived online redo log
4. An inactive online redo log

Arun Chakrapanirao wrote:

>Well one I do want to make clear I have never tried to give bad advice to
>people.
>Since the user in his mail had said that he does not have a backup and does
>not have any online redo logs can you please let me know how else can he
>open the database, when he said he does not have a back it assumes that he
>does not have a os backup and also the rman backup.
>This might be the undocumented thing but this Is the only way it works
>And this had happened in one our case and the only way we could open the
>database is to force open the database in a corrupt mode take an export and
>import back into the new database.
>
>If you still think I am trying to give a bad advice well sorry that I am
>giving bad advices.
>
>
>-----Original Message-----
>Sent: Thursday, September 19, 2002 12:33 AM
>To: Multiple recipients of list ORACLE-L
>
>Arun, since WHEN has been using undocumented parameters the normal way
>of doing things, I think you need to go back and lookup backup/recovery
>concepts.
>
>Feel free to read both user managed and RMAN backup recovery
docs/scenarios.
>
>You are giving bad advice to people on the list who might be new.
>
>joe
>
>
>Arun Chakrapanirao wrote:
>
>
>
>>The only way u can open your database is to add a parameter file
>>as
>>
>>_allow_resetlogs_corruption=TRUE
>>
>>_corrupted_rollback_segments= TRUE
>>
>>_offline_rollback_segments=(the rollback segment names)
>>
>>activate the database and then immediately take an export of the whole
>>database.
>>Create a new database and then import all the data to this new database.
>>
>>
>>-----Original Message-----
>>Sent: Wednesday, September 18, 2002 5:23 PM
>>To: Multiple recipients of list ORACLE-L
>>
>>Nop, all redo logs gone away...
>>
>>----- Original Message -----
>>To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
>>Sent: Wednesday, September 18, 2002 5:43 PM
>>
>>
>>
>>
>>
>>
>>>What about mirrored redo group members?
>>>
>>>Igor Neyman, OCP DBA
>>>ineyman_at_perceptron.com
>>>
>>>
>>>
>>>----- Original Message -----
>>>To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
>>>Sent: Wednesday, September 18, 2002 4:30 PM
>>>
>>>
>>>Hi people...
>>>
>>>What to do if I have LOST ALL REDO LOGS and i donīt have any backup?
>>>
>>>Thanks in advance!
>>>
>>>:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>>>Gilberto Gampert Universidade de Passo Fundo
>>>Administrador de Banco de Dados Passo Fundo - RS - Bra5il
>>>gampert@upf.br http://www.upf.br
>>>:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>>>
>>>
>>>--
>>>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>>>--
>>>Author: Gilberto Gampert
>>> INET: gampert_at_upf.br
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>>
>
>
>

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Author: Joe Testa
  INET: jtesta_at_dmc-it.com

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