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Home -> Community -> Mailing Lists -> Oracle-L -> Re: function index concepts - urgh
if you change your script, you will be able to make a rowid match (assuming the last/first name combinations are unique). If you don't change the script, you will get an index range scan. Oracle will match the upper(last_name) and will then have to read every row with that last name and do an upper on the first name.
>From: Dennis Taylor <ismgr_at_pctc.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Re: function index concepts - urgh
>Date: Mon, 12 Mar 2001 07:31:20 -0800
>
>At 11:25 AM 3/10/01 -0800, you wrote:
> >
> >This should do it.
> >
> >select * from holder
> >where last_name = upper('Taylor')
> >and first_name = upper('Dennis');
>
>Hm. Intuitively then, I should change my index creation script from
>
>(UPPER(LAST_NAME||' '||FIRST_NAME))
>
>to
>
>(UPPER(LAST_NAME)||' '||UPPER(FIRST_NAME))
>
>Or is the optimizer intelligent enough to pull it out of the first example?
>
>
> >
> >And no it's not Friday, it is now Saturday. ;)
> >
>
>Go home! Uh, no, wait. It's Monday now.
>
>
>Dennis Taylor
>--------------------------------
>The light at the end of the tunnel is the headlamp of an oncoming train.
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Dennis Taylor
> INET: ismgr_at_pctc.com
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: carmichr_at_hotmail.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_at_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).Received on Mon Mar 12 2001 - 11:26:19 CST
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