i know how to choose the index i want. im wondering if there is a way to tell oracle what type of index scan to use. i know you can choose a fast full scan, but what about forcing a unique scan? just because oracle uses a unique index does not mean it always chooses the most efficient TYPE of index scan. > > From: Michal Zaschke <[EMAIL PROTECTED]> > Date: 2003/06/18 Wed AM 08:20:04 EDT > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > Subject: Re: how to hint a unique index scan? > > You can define the exact index you want to use. > > /*+ INDEX ( table [index [index]...] ) */ > > HTH, > Mike > > > [EMAIL PROTECTED] wrote: > > Is there anyway to hint a specific type of scan? I know you can hint a fast full > > scan. > > > > I have something odd happening. I made a copy of a tablespace and transported that > > copy with in the same instance. So in the one instance. I have two copies of this > > tablespace. > > > > I have two tables that are 99% identical. IE one has about 1% more records and if > > you validate the indexes on each they are also less than 1% apart. > > > > Now in one tablespace an update does an Unique Scan and in the other the EXACT > > same update does a full scan and runs ALOT slower. I want to mess around. > > > > anyway to force a unique index scan? Both tables are analyzed. > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Michal Zaschke > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (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). >
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: <[EMAIL PROTECTED] INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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).
