RE: Index question ???

From: Christopher Spence <cspence_at_FuelSpot.com>
Date: Wed, 22 Aug 2001 08:13:58 -0700
Message-ID: <F001.00373F10.20010822075648@fatcity.com>

Also a
lock will be established on deletes.

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-----Original Message-----From: Koivu, Lisa [mailto:lisa.koivu_at_efairfield.com] Sent: Tuesday, August 21, 2001 2:22 PMTo: Multiple recipients of list ORACLE-LSubject: RE: Index question ???
 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----- <FONT

    face=Arial size=1>From:   <FONT face=Arial 
    size=1>Andrea Oracle [SMTP:andreaoracle_at_yahoo.com] <FONT 
    face=Arial size=1>Sent:   <FONT face=Arial 
    size=1>Tuesday, August 21, 2001 14:06 <FONT face=Arial 
    size=1>To:     <FONT face=Arial 
    size=1>Multiple recipients of list ORACLE-L <FONT face=Arial 
    size=1>Subject:        <FONT 
    face=Arial size=1>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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Received on Wed Aug 22 2001 - 10:13:58 CDT