Re: memory problem - oracle 10203 on HPUX

How much swap is configured on the server?

On Jan 19, 2008 8:21 PM, <krish.hariharan_at_quasardb.com> wrote:

> Ujang,
>
> You are addressing two separate perhaps related issues - swap usage and
> machine reboot. I would tackle the latter since that tends to have
> messages
> in the syslog or the crs/css logs.
>
> Once you know why that is the case you may have to set up monitors to
> track
> the swap usage and see process activity.
>
> I am not experienced in HP system commands. You should work with your SA
> but
> a simple start might be a ps -ef and correlated swap usage (swap -s).
> These
> may be different for HPUX.
>
> Regards,
> -Krish
> Krish Hariharan
> President/Executive Architect, Quasar Database Technologies, LLC
> http://www.linkedin.com/in/quasardb
>
>
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
> On Behalf Of Ujang Jaenudin
> Sent: Saturday, January 19, 2008 6:47 PM
> To: krish.hariharan_at_quasardb.com; oracle-l
> Subject: Re: memory problem - oracle 10203 on HPUX
>
> krish,
>
> the CPU utilization never goes up more than 30%.
> and luckily no log/trace files on all stack OS/clusterware/database,
> when reboot happened.
>
> MTS is another plan....
>
> but why there is so many big difference between oracle reported (AWR) and
> OS??
> I thinking of OS memory management problem, how to dig into it?
>
> oh ya OS version is B.11.11 HP-UX PA-RISC.
>
>
> regards
> ujang
>
>
> On Jan 20, 2008 8:20 AM, <krish.hariharan_at_quasardb.com> wrote:
> > Ujang,
> >
> > Since you mention RAC I suspect this is probably node eviction - the
> cause
> > could be cpu utilization (not mentioned) or swap consumption preventing
> > heart beat messages and consequently resulting in node eviction. Look at
> the
> > ocssd.log on the surviving node. How many nodes in your cluster and how
> busy
> > are the other nodes (cpu, swap)?
> >
> > If my understanding of memory usage is correct (as seen in Solaris) the
> > process maps the SGA and is part of its virtual space and has to reserve
> > swap proportional to it. I address that using shared servers (MTS) since
> > only a few processes (in your case 50) need be active and not the 1500
> since
> > you can get away with about 75 shared servers processes (if you are not
> > already using this capability).
> >
> > The system logs or the crs/css logs will give you that information. The
> > other thing to look for is the progressive build up and usage of swap.
> >
> > Regards,
> > -Krish
> > Krish Hariharan
> > President/Executive Architect, Quasar Database Technologies, LLC
> > http://www.linkedin.com/in/quasardb
> >
> >
> > -----Original Message-----
> > From: oracle-l-bounce_at_freelists.org [mailto:
> oracle-l-bounce_at_freelists.org]
> > On Behalf Of Ujang Jaenudin
> > Sent: Saturday, January 19, 2008 5:36 PM
> > To: oracle-l
> > Subject: memory problem - oracle 10203 on HPUX
> >
> > folks,
> >
> > I have a machine (RAC configuration) 10.2.0.4 on HPUX - PARISC.
> > in a node I have 38GB physical memory, 8 processors.
> > the machine could not run with asynchronous IO, so I set io slave to
> > 8, and dbwr to 1.
> >
> > at AWR report, it said that 2GB memory for PGA is enough, and 12GB of
> > SGA mostly enough.
> > concurrent user is 1000 until maximum 1500 users connected.
> > at one time only 30-50 concurrent active with OLTP transaction.
> >
> > at the OS perspective, it said that mostly 90-100% memory has been
> used,
> > even when high load, 50% of the swap will be used also.
> > almost every 20 days, the server is rebooted itself,
> > I think this is due to lack of memory....
> >
> > why between OS and oracle side there has much big different of memory
> > usage???
> >
> >
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>
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>

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