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InformationEnglish
server memory utilisation went to 95-98% even with less users login
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06-26-2010 01:28 AM
06-26-2010 01:28 AM
I would like to seek your advice. we have new database server HPUX 11.23i running latest oracle version (with oracle replication enabled to DR site). the memory is 32GB and it running financial application and we are at the testing stage. strangely, every time we started the oracle instances and start few connections from application, the memory utilisation went up to 90%. not much paging activity. wondering why only physical memory using and not using much of the paging space. how to optimise/improve the memory utilisation so that the application is faster.
have u experienced this? would really appreciate your advice. Many thanks in advance
Solved! Go to Solution.
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06-26-2010 02:41 AM
06-26-2010 02:41 AM
Re: server memory utilisation went to 95-98% even with less users login
Re: server memory utilisation went to 95-98% even with less users login
Follow below commands.
1. # kmtune -q dbc_pct_max
Note: The -q option displays information about the tunable.
2. # kmtune -s dbc_pct_max=20
Note: This will change the value.
3. # grep
Note: Check new value is in the system file.
4. # config -u /stand/system
Note: Build the kernel and reboot.
5. # shutdown -ry 0
NOTE: Please note that the above steps require reboot of the system hence plan for a downtime.
Rgd's
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06-26-2010 05:11 AM
06-26-2010 05:11 AM
Re: server memory utilisation went to 95-98% even with less users login
Re: server memory utilisation went to 95-98% even with less users login
Regards
Ishwar Venugopal
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06-26-2010 06:13 AM
06-26-2010 06:13 AM
Re: server memory utilisation went to 95-98% even with less users login
Re: server memory utilisation went to 95-98% even with less users login
Not a well-defined entity.
> [...] wondering why only physical memory
> using and not using much of the paging
> space. [...]
Huh? If there's still physical memory
available, why would the system want to use
the disk? As I understand virtual memory,
one tries to use physical memory until it's
all used, and then one starts to use the
disk (page/swap) to deal with what won't all
fit into physical memory.
Which of us is confused?
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06-26-2010 07:21 AM
06-26-2010 07:21 AM
SolutionDo you think your application is slow considering current system configuration?
( above 90% memory usage is not a bottle neck)
1. you system memory usage is above 90%
2. You cant see any swaping/paging ( This is actually good - this means there is no memory bottle neck)
This is not memory bottleneck, I have seen systems which runs with 99% memory usage and no swaping whole time.
Before giving some suggetions and action plans, you may need to check more data.
Did you check other resources? DISK, CPU and NTW?
To analyse memory usage , you may need to check which arena using memory ,
IS that system memory or application?
Then need to do trouble shooting.
Do you have any similar system which run the application to compare and contrast?
======
After analysing the usage, if you want to change dynamic buffercache, it is dynamic parameter in 11.23 . You can change that with out reboot.
=======================================================
# kctune |grep dbc
dbc_max_pct 50 Default Immed
dbc_min_pct 5 Default Immed
=======================================================
below is Oracle tuning doc
http://download.oracle.com/docs/html/B10812_06/chapter8.htm
Regards,
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