RE: Database with NOLOGGING everywhere
Date: Mon, 7 Apr 2008 08:09:55 -0400
NOLOGGING is not really what you think it is. This attribute is *only* enforced when you create the table brand new. Once the table exists, all updates are logged. So whomever set this up is not really acomplishing what he/she thought they were doing.
If you are not using Rman, you should be. There is nothing like a good backup to help one sleep at night.
From the Docs:
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Kline.Michael
Sent: Sunday, April 06, 2008 2:09 PM
Subject: Database with NOLOGGING everywhere
I've got a 1.08TB warehouse that is pretty much all "batch mode".
Because of that "batching" they have almost 80-95% of the production
tables set to NOLOGGING, including many at the tablespace level.
We normally rely on shadow copies, but the database is archivelog.
Given all the NOLOGGING, what could I possibly hope to "recover" if I
ever had to use those archivelogs????
The shadow copy is going to naturally be a COLD backup, I would think that would make the archivelogs practically useless. Mind you, I may be able to copy a datafile from the shadow copy, and then apply archive logs, but again, with all the NOLOGGING defined, what can I hope for in the recovery? I guess I can pick up the table creates and all, but the data would have to be all repopulated through the batch runs?
I inherited this one.
This is at 22.214.171.124, but when we do the next conversion, I think I'm going to push for a "more normal" archivelog + LOGGING configuration, RMAN backups and some shadow copy for other things that database has to do.
Looking for someone who may have been caught in this situation and how you managed. That good old "Been there done that, ended up doing ..." type thing. Been very fortunate thus far. Michael Kline
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