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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