Re: Rant

What Ruth describes is "tablespace point in time recovery" or incomplete recovery. I believe the question was about performing complete recovery on a single tablespace while the rest of the database is in use. (I could be wrong in this assumption.)

If a single tablespace (other than SYSTEM!) needs complete recovery, then:

1. SQL> alter tablespace BAD_ONE offline;
2. restore corrupted tablespace datafile(s) from backup
3. restore archive log(s) from backup if necessary
4. SQL> recover tablespace BAD_ONE;
5. SQL> alter tablespace BAD_ONE online;

While this is happening, object in other tablespaces are fully accessible, except that there may be some issues with objects in other tablespaces that reference objects in the BAD_ONE tablespace (e.g. foreign key constraints referencingtables in BAD_ONE, tables in other tablespaces with CLOBs stored out-of-line in BAD_ONE, tables with primary or unique key constraint indexes in BAD_ONE, etc.). There are a few variations on the theme for step 5 - for example, "recover datafile" perhaps if all the datafiles for the tablespace are not corrupted.

Don Granaman
[certifiable OraSaurus]

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, July 22, 2002 1:13 PM

You have to restore the tablespace with the datafile you want to restore to a clone database and export the datafile's contents from the clone and import it into the database with the bad datafile.

HTH,
R
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, July 22, 2002 12:13 PM

I read your rant, and I agree with you. But I do have one little itsy bitsy question...

> I also asked them how they'd put a tablespace in
> backup mode. Simple enough, right? Not one of them
> got it right. Not even close. Didn't have clue as to
> what I was talking about. Fair enough, you don't
> know. Well how about a simple recovery scenario. I
> asked every candidate how they would do an online
> recover of a datafile while the database was still in
> use. No ideas. Not even close.

How DO you do an online recovery of a datafile while the database is still in use? I've had to do recoveries before, but never this scenario.

Thanks,
Mike

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Author: Ruth Gramolini
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