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Oracle memory issue.

SDVICK
Occasional Advisor

Oracle memory issue.

Hello all,

I'm fairly new to tuning Oracle on HP-UX (all my previous experience was with other DB types) so I'm hoping someone can help me with an issue that I'm having.

At least twice a week we run into an issue where Oracle (and it's associated applications) spins out of control and "eats" all of the memory and swap on the server. CPU and disk I/O is next to zero.

I checked swapinfo and less than 10% of the physical swap is being used.

Here are the system vitals:
Model: rp8420
CPU: 10
Memory: 16 Gb
Swap: 16 Gb (across 4 devices)
Oracle: 9.2.0.4 64bit

Does anyone have an idea of some things that I can check to try and relieve this pressure or is this something that I need to have my DBA's work w/ Oracle on?

Thanx in advanced.
4 REPLIES
Steven E. Protter
Exalted Contributor

Re: Oracle memory issue.

Shalom,

You may have a memory leak. Memory leak detector:

http://www.hpux.ws/?p=8

General performance measurement.

http://www.hpux.ws/?p=6

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Oviwan
Honored Contributor

Re: Oracle memory issue.

Hi

Oracle 9.2.0.4 is a really old version, if it's possible you should migrate to 9.2.0.8 or 10gR2 or even 11g.

What's the version of HPUX?
uname -a

What's the size of the SGA?
show parameter sga

Regards
SDVICK
Occasional Advisor

Re: Oracle memory issue.

OS: HP-UX 11.11
SGA: 554 mb

Can't upgrade the DB at this time. Business won't let us.
Oviwan
Honored Contributor

Re: Oracle memory issue.

your sga is 554m and you have 16gb memory, does your application eats a lot of memory? if not extend your sga size.

and also check your buffer cache kernel parameter:
# kmtune | grep dbc
dbc_max_pct
dbc_min_pct

I think they are also to high. for more infos check this:
http://docs.hp.com/en/5991-0710/ch04s01.html

maybe some useful infos for swap:
http://docs.hp.com/en/1219/tuningwp.html#swap

HTH