Re: ROW CACHE HIGH - Priority 1

sql parsing would be reflected in Library cache not rowcache

Basic stuff

Sam
----- Original Message -----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Wednesday, September 24, 2003 1:14 PM

> 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: Mladen Gogala
> INET: mladen_at_wangtrading.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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-- 
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-- 
Author: Sam Roberts
  INET: rabbit_at_emirates.net.ae

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