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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Author: =?ISO-8859-1?Q?Mogens_N=F8rgaard?=
  INET: mln_at_miracleas.dk

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