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RE: Insert

From: Toepke, Kevin M <>
Date: Tue, 27 Mar 2001 06:37:47 -0800
Message-ID: <>

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

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-----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!>>

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Author: Toepke, Kevin M

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

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