Re: Doubt related to ROWID
Date: Wed, 24 Jul 2013 16:04:10 +0100
Message-ID: <B3E68C67C7384217AF586C087E3A8BB6_at_Primary>
Well,
You could avoid the LIO by using the result cache, but there are far fewer latches on the result cache, so not doing the LIO might cause more contention and therefore be more resource-intensive than doing the LIO ;)
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com/all-postings
Author: Oracle Core (Apress 2011)
http://www.apress.com/9781430239543
- Original Message -----
From: "Ric Van Dyke" <ric.van.dyke_at_hotsos.com>
To: "Jonathan Lewis" <jonathan_at_jlcomp.demon.co.uk>;
<John.Hallas_at_morrisonsplc.co.uk>; <JSweetser_at_icat.com>;
<ecandrietta_at_gmail.com>; "ORACLE-L" <oracle-l_at_freelists.org>
Sent: Wednesday, July 24, 2013 4:01 PM Subject: RE: Doubt related to ROWID
The best LIO there is! Other than not doing one at all.... :-)
-----Original Message-----
From: Jonathan Lewis [mailto:jonathan_at_jlcomp.demon.co.uk]
Sent: Wednesday, July 24, 2013 10:57 AM
To: Ric Van Dyke; John.Hallas_at_morrisonsplc.co.uk; JSweetser_at_icat.com;
ecandrietta_at_gmail.com; ORACLE-L
Subject: Re: Doubt related to ROWID
Slightly better even than "one LIO" - with the correct configuration (and a bit of luck, sometimes) it can be a "consistent get - examination", which is an LIO that requires only a single latch, and accesses the buffer while holding the latch rather than having to go through the whole pin cycle.
-- http://www.freelists.org/webpage/oracle-lReceived on Wed Jul 24 2013 - 17:04:10 CEST