IOT or not IOT : second post

From: paquette stephane <stephane_paquette_at_yahoo.com>
Date: Wed, 27 Jun 2001 07:26:03 -0700
Message-ID: <F001.00339E4E.20010627063529@fatcity.com>

This is a second post, I thought I would have more than 1 answer

Hi all,

Vacation is over !

We'll have some tables with a PK and between 1 and 3 other fields . Those tables will be insert once and read 2 to 7 times.
I'm wandering about the use of IOT and done some tests.

When inserting 700 000 rows, the IOT and the standard table with a PK took the same time .

When reading by querying on the PK in a loop (looping 700 000 times) I have the same total query time but the IOT is reading 1 300 000 blocks and spending more time in the execute phase than in the fetching phase, the standard table with PK is reading 2 000 000 blocks and spending just a little bit more time in the executing phase than the fetching phase.

Those tables may not benefit from a lot of caching since there are in the staging area of a DW system.

Any advices or bad experience on IOT (Oracle 816, DW system) ?

Stéphane Paquette
DBA Oracle, consultant entrepôt de données Oracle DBA, datawarehouse consultant
stephane_paquette_at_yahoo.com

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