RE: Index question ???

From: Koivu, Lisa <lisa.koivu_at_efairfield.com>
Date: Tue, 21 Aug 2001 11:26:01 -0700
Message-ID: <F001.00372C94.20010821102210@fatcity.com>

Andrea,

It is recommended, not required.  Anytime the db needs to verify the fk constraint, if there isn't an index there to support it, a full table scan will happen.  Performance killer.

What do you mean your indices disappeared?  Can you elaborate? 

-----Original Message-----

From:   Andrea Oracle [SMTP:andreaoracle_at_yahoo.com]
Sent:   Tuesday, August 21, 2001 14:06
To:     Multiple recipients of list ORACLE-L

Subject:        Index question ???

Hi, all

I got couple of indices questions:

Is it REQUIRED or just recommended to build an index on FK column/s?

I used Alter Table ... Move and Alter Index ... Rebulid to move the table into differenct block and then rebuild index.  Table Move works fine, but after index rebuilt, some indices disappeared! How come?

Thanks!

Andrea

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Author: Andrea Oracle
  INET: andreaoracle_at_yahoo.com

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