Jon,
Thanks for the email. My next question is fairly obvious...I'm getting a
lot of waits on this latch (up to 5% of all waits) - how do I tune it ?
(We've got a pretty typical environment here, a few big tables with parallel
degree 4, on a 2 cpu box with 2G of RAM, and only a couple of end users
doing big queries)...
Any guidelines (from anybody) would be much appreciated...
TIA
Ben
From: Jon Walthour [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Subject: RE: Latch 'parallel query qref latch'
Date: Thu, 14 Jun 2001 13:01:56 -0800
Ben:
The qref latch is obtained for each Parallel Query process. It
is acquired before the queue buffers can be manipulated so that
communication can take place between the various slave processes.
The latch is acquired for putting messages into the buffer. You
will generally see lots of misses for this latch since it is
acquired with a nowait option.
Jon Walthour, OCDBA
Oracle DBA
Computer Horizons
Cincinnati, Ohio
--- Original Message ---
From: Ben Jones [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Date: 6/14/01 1:56:36 PM
Does anyone know what causes waits on this latch ?
Thanks
Ben
_
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Ben Jones
INET: [EMAIL PROTECTED]
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: [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.com
--
Author: Jon Walthour
INET: [EMAIL PROTECTED]
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: [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).
_
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Ben Jones
INET: [EMAIL PROTECTED]
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: [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).
