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тАО07-21-2009 11:09 PM
тАО07-21-2009 11:09 PM
Server-IA, HPUX 11.23, Oracle 10G, Flex Application, 12GB RAM, with around 300 users are connecting at a time.
I have noticed that my physical and virtual memory utilization is above 80% in all most time but there is performance issue has been reported yet.But shall I know any way to reduce the utilization as I have 12 GB RAM and secondary swap has been enabled and only 300 users are using at atime.
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 12288 562 11726 5% 0 - 1 /dev/vg00/lvol2
dev 4096 561 3535 14% 0 - 1 /dev/vg00/lvol10
reserve - 12374 -12374
total 16384 13497 2887 82% - 0 -
TOP output
============
Memory: 9309372K (3606288K) real, 12695532K (4737400K) virtual, 110836K free Page# 1/17
morover could you plesae let me know what is - Page# 1/17
awaiting for your valuable tips.
Solved! Go to Solution.
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тАО07-21-2009 11:12 PM
тАО07-21-2009 11:12 PM
Re: High Memory utilization
My dbc_max and dbc_min values are
Tunable Value Expression Changes
dbc_max_pct 10 10 Immed
Tunable Value Expression Changes
dbc_min_pct 5 Default Immed
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тАО07-21-2009 11:35 PM
тАО07-21-2009 11:35 PM
Re: High Memory utilization
Show output of:
kctune swapmem_on
HTH
Duncan
I am an HPE Employee
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тАО07-21-2009 11:49 PM
тАО07-21-2009 11:49 PM
Re: High Memory utilization
swapmem_on gives following out put.
Tunable Value Expression
swapmem_on 0 0
what does it means?
There is no performance issue reported till noe, but just want to know why this much of utilization as I have 12GN physical mem and only 300 users using the server.
Or its normal utilization.
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тАО07-22-2009 12:30 AM
тАО07-22-2009 12:30 AM
Re: High Memory utilization
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тАО07-22-2009 12:53 AM
тАО07-22-2009 12:53 AM
SolutionBe aware however that changing this to 1 will require a reboot...
> There is no performance issue reported
> till noe, but just want to know why this
> much of utilization as I have 12GN
> physical mem and only 300 users using the
> server.
There's almost no way anyone can help you with that as we know nothing about your application or database, or the queries that run in it... for all we know this may be perfectly normal, or it may be way out of whack. What I would say is that you certainlky shouldn't assume that this means that each user requires ( 12GB * 80% ) / 300 memory - Oracle sets aside a whole bunch of memory when it starts even if no users are connected.
If you really want to track this in a useful fashion you should write a script to record the number of users in the database and memory utilized at any given time - as I don't know what tools you have or how you figure out the number of users in your system, it's difficult to suggest how right now...
HTH
Duncan
I am an HPE Employee
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тАО07-22-2009 12:56 AM
тАО07-22-2009 12:56 AM
Re: High Memory utilization
Where do you see that physical memory is utilised above 80%? Anyway, important question here is, why do you feel that above 80% utilisation is performance issue?
We paid for 100% resources available on the server and we suppose to utilise 100%. If the resouce utilisation is reached 100% then we can think about further.
There are many things involved to utilise the resources not just only the users as you specified. There are applications more cpu bound, some applications need more memory. You need to analyse all these data and act accordingly.
Ganesh.
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тАО07-22-2009 01:09 AM
тАО07-22-2009 01:09 AM
Re: High Memory utilization
Pls correct me if I am wrong....
If am enabling the swapmem_on, psuedo swap will enabled and it will reduce the swap reserved memory (reserve - 12374 -12374).
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тАО07-22-2009 01:15 AM
тАО07-22-2009 01:15 AM
Re: High Memory utilization
HTH
Duncan
I am an HPE Employee
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тАО08-11-2009 11:21 PM
тАО08-11-2009 11:21 PM
Re: High Memory utilization
Thanks for the repply, am closing this thread.