Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
![]() |
![]() |
Home -> Community -> Mailing Lists -> Oracle-L -> Re: Tuning views
Hi
Don't just tune the views but see how they are used by looking in the sql-area views or tracing a session that uses it in the way it's normally used. than tune what you find (if not app created sql this shoud be possible)
Jack
"Jesse, Rich" <Rich.Jesse_at_QTIWO To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> RLD.COM> cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL) Sent by: Subject: Tuning views root_at_fatcity.com 28-06-2002 21:56 Please respond to ORACLE-L
Hey all,
We have a multitable view setup on our 8.1.7.2.0 HP/UX 11.0 DB for
security,
so our users can use <gulp> MS Ack-sess to query a few columns from some
sensitive tables. In other words, the view doesn't filter rows, just
columns. The problem is that the author of the view explicitly set the
RULE
hint and it seems to be causing a few performance problems when joining the
view to other tables.
So, I'll "fix" the view and be the hero, right? <sigh> Well, how do you
tune a multitable view when you don't know how it's going to be used?
After
fixing a little join mishap, I added hints for FIRST_ROWS, as well as FULL
for the super small 1-block tables. This seems to me to be valid, since
the
users of the view will (hopefully) filter the rows based on an index of one
or more of the tables of the view, but I don't really have any proof other
than a pretty-looking explain plan.
Anyone have a philosophy or procedure for tackling something like this? Preferrably one that ends in "drink beer"?
TIA!
Rich Jesse System/Database Administrator Rich.Jesse_at_qtiworld.com Quad/Tech International, Sussex, WIUSA
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jesse, Rich INET: Rich.Jesse_at_qtiworld.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-LReceived on Mon Jul 01 2002 - 02:38:19 CDT
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing). =================================================================== De informatie verzonden in dit e-mailbericht is vertrouwelijk en is uitsluitend bestemd voor de geadresseerde. Openbaarmaking, vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan derden is, behoudens voorafgaande schriftelijke toestemming van Ernst & Young, niet toegestaan. Ernst & Young staat niet in voor de juiste en volledige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor tijdige ontvangst daarvan. Ernst & Young kan niet garanderen dat een verzonden e-mailbericht vrij is van virussen, noch dat e-mailberichten worden overgebracht zonder inbreuk of tussenkomst van onbevoegde derden. Indien bovenstaand e-mailbericht niet aan u is gericht, verzoeken wij u vriendelijk doch dringend het e-mailbericht te retourneren aan de verzender en het origineel en eventuele kopieën te verwijderen en te vernietigen. Ernst & Young hanteert bij de uitoefening van haar werkzaamheden algemene voorwaarden, waarin een beperking van aansprakelijkheid is opgenomen. De algemene voorwaarden worden u op verzoek kosteloos toegezonden. ===================================================================== The information contained in this communication is confidential and is intended solely for the use of the individual or entity to whom it is addressed. You should not copy, disclose or distribute this communication without the authority of Ernst & Young. Ernst & Young is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt. Ernst & Young does not guarantee that the integrity of this communication has been maintained nor that the communication is free of viruses, interceptions or interference. If you are not the intended recipient of this communication please return the communication to the sender and delete and destroy all copies. In carrying out its engagements, Ernst & Young applies general terms and conditions, which contain a clause that limits its liability. A copy of these terms and conditions is available on request free of charge. =================================================================== -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jack van Zanen INET: nlzanen1_at_EY.NL 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).
![]() |
![]() |