From cspence@FuelSpot.com Wed, 22 Aug 2001 08:13:58 -0700 From: Christopher Spence Date: Wed, 22 Aug 2001 08:13:58 -0700 Subject: RE: Index question ??? Message-ID: MIME-Version: 1.0 Content-Type: text/plain Title: Message Also a lock will be established on deletes.     "Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes." Christopher R. Spence Oracle DBA Phone: (978) 322-5744 Fax:    (707) 885-2275 Fuelspot 73 Princeton Street North, Chelmsford 01863   -----Original Message-----From: Koivu, Lisa [mailto:lisa.koivu@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----- From:   Andrea Oracle [SMTP:andreaoracle@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 __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Andrea Oracle   INET: andreaoracle@yahoo.com Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051 San Diego, California        -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from).  You may also send the HELP command for other information (like subscribing).