RE: Index-Organized Table experiences

  • From: "syed jaffar hussain" <sjaffarhussain@xxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Wed, 28 Apr 2004 17:26:29 +0300

I hope Mr. Jonathan can give you very good suggestions about your
questions.

Best Regards,

Syed Jaffar Hussain
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Daniel Fink
Sent: Wednesday, April 28, 2004 5:15 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Index-Organized Table experiences


We are looking to implement IOTs for a couple of intersection
entities in a 10g db. I would like to hear from those brave
enough to actually use IOTs what is the good, the bad and the
ugly. 

example:

Employee (heap table)
Project (heap table)

There is a many-to-many relationship between the tables (1
employee can be on many projects and 1 project can have many
employees).

The emp_project table is the intersection entity containing
emp_id and project_id as the only columns. There are FK
constraints on each of the columns. The combination of emp_id
and project_id is unique.

This situation  *sounds* like the right one for an IOT,
otherwise we would have 1 table and 2 indexes (1 on each
column).

My main concerns are:
1) Integrity/performance
2) Locking behavior (do I need to adhere to the traditional
"index all foreign keys" rule to prevent excessive locking?)
3) Any especially nasty gotchas

Thanks,
Daniel
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