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. [EMAIL PROTECTED]
-----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@LIFE To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> TOUCH.COM> cc: Sent by: Subject: Nologging index tablespaces? [EMAIL PROTECTED] 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. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).