RE: Index-Organized Table experiences

From: Goulet, Dick <DGoulet_at_vicr.com>
Date: Wed, 28 Apr 2004 11:00:53 -0400
Message-ID: <4001DEAF7DF9BD498B58B45051FBEA656D8464@25exch1.vicorpower.vicr.com>

Or that the data is in the index tablespace. Who really cares?

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA

-----Original Message-----
From: Rachel Carmichael [mailto:wisernet100_at_yahoo.com] Sent: Wednesday, April 28, 2004 10:58 AM To: oracle-l_at_freelists.org
Subject: Re: Index-Organized Table experiences

85 million row table, key was coupon code and "used/unused" flag .... updates were done in batches as the coupons were processed. We did NOT have performance problems. We didn't have to worry about the FK index as it was a standalone table.

No gotchas under the conditions we used it.=20

I see scattered implementations of IOTs here and again, all I hear are good things about it (other than the "index" is in the "data" tablespace.... running and ducking now!)

• Daniel Fink <Daniel.Fink_at_Sun.COM> wrote:
  > 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.=20
  >=20
  > example:
  >=20
  > Employee (heap table)
  > Project (heap table)
  >=20
  > There is a many-to-many relationship between the tables (1
  > employee can be on many projects and 1 project can have many
  > employees).
  >=20
  > 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.
  >=20
  > This situation *sounds* like the right one for an IOT,
  > otherwise we would have 1 table and 2 indexes (1 on each
  > column).
  >=20
  > 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
  >=20
  > Thanks,
  > Daniel
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=09

        =09

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Received on Wed Apr 28 2004 - 09:59:05 CDT