Oracle-L: RE: Nologging index tablespaces?

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Mon, 10 Jun 2002 14:28:36 -0800
Message-ID: <F001.004799ED.20020610142836@fatcity.com>

Cherie

Thanks for the input. This would be an OLTP database, with continual inserts/updates/deletes. I guess that CREATE INDEX NOLOGGING would save something in the redo logs. I'm not convinced that having a tablespace containing only indexes set to NOLOGGING would save redo. Since redo is usually created by SQL statements (as I understand it), there wouldn't be any redo against the index, unless you do an ALTER INDEX REBUILD. The downside of this would be that in a recovery you would have to remember to rebuild the indexes in that tablespace. If there isn't much benefit, then I don't like even a small cost.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----

Sent: Monday, June 10, 2002 2:28 PM
To: Multiple recipients of list ORACLE-L

Dennis,

We have set particular indexes to nologging when building them. These are indexes that we drop every night for our warehouse load.

It is a hassle because whenever we clone this database to our QA box, those nologged indexes get corrupt and we have to rebuild them. Takes us three hours to do. We have recovered the database too and did have to rebuild the indexes after. I guess you have to balance the regular time-savings in building/rebuilding indexes with the time cost in mean-time-to-recover.

I've never changed an entire index tablespace to nologging.

Cherie Machler
Oracle DBA
Gelco Information Network

                    DENNIS WILLIAMS

                    <DWILLIAMS_at_LIFE       To:     Multiple recipients of
list ORACLE-L <ORACLE-L_at_fatcity.com>     
                    TOUCH.COM>            cc:

                    Sent by:              Subject:     Nologging index
tablespaces?                               
                    root_at_fatcity.co

                    m

 

 

                    06/10/02 01:33

                    PM

                    Please respond

                    to ORACLE-L

Have any of you changed your index tablespaces to NOLOGGING? Offhand it seems like a possible performance increase and less redo, but at the expense
of having to remember to rebuild the indexes in a recovery. And I don't like
to have special things to remember in a crisis. Dennis Williams 20% OCP
DBA
Lifetouch, Inc.

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Author: DENNIS WILLIAMS
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