Oh, it's not me, I was just replying to somebody. My company is not running
RAC.
I know what clustering means, I have 5+ years of experience with OPS on both
versions 7 and 8 plus I used to teach people VMS and how to tune it. Yeah,
you're absolutely right clustering is flustering, don't do it unless that
is
what you really, really want & need. Especially need.
--
Mladen Gogala
Oracle DBA
> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> Behalf Of Mogens Nørgaard
> Sent: Wednesday, September 24, 2003 7:35 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: ROW CACHE HIGH - Priority 1
>
>
> I HAVE to ask this question: Is it possible for you to turn
> off RAC and
> thereby completely avoiding this issue?
>
> Yeah, that's kind of funny. Except it isn't, really. Invalidations of
> objects, drops, in general breaking of breakable parse locks
> - they will
> all need to be communicated to all the other instances. But
> this kind of
> activity is often forgotten in lieu of the "normal" buffer
> cache activity.
>
> Undskyld. But the best optimisation is not to do it :-).
>
> Mogens
>
> Mladen Gogala wrote:
>
> >General answer: upgrade to 9.2.0.4 and hope that the bug has been
> >fixed. Row cache locks are data dictionary locks. You can see the
> >contents of row cache by inspecting v$rowcache. You may need to
> >increase shared pool. Last but not least, how fast is your private
> >network connection between the two nodes? 100mbit/sec is not nearly
> >fast enough. You need at least a gigabit
> >switch. Also check your SQL for hard parsing (see the executions and
> >invalidations in
> >v$sqlarea), ad-hoc DDL and that kind of stuff.
> >And no, it's not my priority 1.
> >
> >
> >--
> >Mladen Gogala
> >Oracle DBA
> >
> >
> >
> >
> >
> >>-----Original Message-----
> >>From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> >>Behalf Of Muqthar Ahmed
> >>Sent: Wednesday, September 24, 2003 3:50 PM
> >>To: Multiple recipients of list ORACLE-L
> >>Subject: ROW CACHE HIGH - Priority 1
> >>
> >>
> >>Hi,
> >>
> >>I have Oracle 9.2.0.2.0 RAC (two nodes) on IBM AIX.
> >>Currently I am seeing very high number for ROW CACHE LOCK in
> >>statspack.
> >>
> >>Top 5 Timed Events
> >>~~~~~~~~~~~~~~~~~~
> >> % Total
> >>Event Waits
> >>Time (s) Ela Time
> >>-------------------------------------------- ------------
> >> ----------- --------
> >>row cache lock 11,310 5,441
> >> 86.97
> >>CPU time
> >>522 8.34
> >>global cache cr request 32,513 71
> >> 1.14
> >>global cache null to x 21,507 57
> >> 91
> >>log file sync 22,689 49
> >> .78
> >>
> >>-------------------------------------------------------------
> >>
> >> Get
> >> Spin &
> >>Latch Name Requests Misses
> >> Sleeps Sleeps 1->4
> >>-------------------------- --------------
> >>----------- ----------- ------------
> >>library cache 7,094,208 31,499
> >> 1,480 30031/1456/12/0/0
> >>shared pool 2,385,408 6,739
> >> 527 6212/527/0/0/0
> >>ges enqueue table freelist 1,492,275 1,903
> >>124 1780/122/1/0 /0
> >>library cache pin 3,201,008 1,437
> >> 130 1307/130/0/0/0
> >>row cache objects 1,400,498 1,020
> >> 56 964/56/0/0/0
> >>row cache enqueue latch 1,292,843 715
> >>19 696/19/0/0/0
> >>
> >>It is holding row cache lock (v$session_wait), other sessions
> >>are in the queue....due to this, number of concurrent
> >>sessions will increase from 100 to 350 sessions on each node.
> >> In less than one minute everything will be cleared ( OLTP database)
> >>
> >>I have already opened a TAR with Priority 1. Do you have any
> >>suggestions.
> >>
> >>Thanks
> >>Muqthar Ahmed
> >>DBA
> >>
> >>--
> >>Please see the official ORACLE-L FAQ: http://www.orafaq.net
> >>--
> >>Author: Muqthar Ahmed
> >> INET: Muqthar.Ahmed_at_decoratetoday.com
> >>
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> >>
> >
> >
> >
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: =?ISO-8859-1?Q?Mogens_N=F8rgaard?=
> INET: mln_at_miracleas.dk
>
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Note:
This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Wang Trading LLC and any of its subsidiaries each reserve the right to monitor all e-mail communications through its networks.
Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorized to state them to be the views of any such entity.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Mladen Gogala
INET: mladen_at_wangtrading.com
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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Received on Thu Sep 25 2003 - 08:59:38 CDT
