RE: Insert

From: Toepke, Kevin M <ktoepke_at_cms.cendant.com>
Date: Tue, 27 Mar 2001 06:37:47 -0800
Message-ID: <F001.002D8C43.20010327060026@fatcity.com>

Just to add my $0.02....

I was working on a large ODS project where we had to process 8+ million records each night into an Oracle 8i database sitting on a RAID-5 disk array.

At the start of the processing we trucated the table. We used parallel direct-path SQL*Loader (12 instances). We had SQL*loader SKIP_INDEX_MAINTENANCE. After the loads were complete, we rebuild the indexes (3 of them) in parallel (DEGREE 8). The while process took under 10 minutes and was I/O bound the whole time.

Kevin Toepke

The information in this electronic mail message is Cendant Confidential and may be legally privileged. It is intended solely for the addressee(s). Access to this Internet electronic mail message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or action taken or omitted to be taken in reliance on it is prohibited and may be unlawful.

The sender believes that this E-mail and any attachments were free of any virus, worm, Trojan horse, and/or malicious code when sent. This message and its attachments could have been infected during transmission. By reading the message and opening any attachments, the recipient accepts full responsibility for taking protective and remedial action about viruses and other defects. Cendant Corporation is not liable for any loss or damage arising in any way from this message or its attachments.

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

Sent: Tuesday, March 27, 2001 8:01 AM
To: Multiple recipients of list ORACLE-L

Usually one drop indexes before massive inserts. Mostly in data loads in DW - if using direct path in SQL*Loader is not an option. It should be decided on the basis if saved time on inserts > then time to rebuild an indexes. Also you cannot drop indexes if system should be available during inserts. (PK, Unique, FK constraints, performance).

Oracle does not rebuild indexes during inserts - please RTFM. Index organized tables are not good candidates for tables with a lot of DML - performance issues.

Alex Hillman
<<snip, snip. Ouch!! That hurt. Now, quit that! Ouch!!! I said stop that!>>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Toepke, Kevin M
  INET: ktoepke_at_cms.cendant.com

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: ListGuru_at_fatcity.com (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).

Received on Tue Mar 27 2001 - 08:37:47 CST