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тАО04-25-2010 11:12 PM
тАО04-25-2010 11:12 PM
swapinfo -tam HIGH (dbc_max_pct=50)
OS:HPUX 11.11
Oracle Application 9.0.4
Problem:Memory usage high
RAM 8GB
My memory usage is very high 94% and i need an expert advice upon this issue,
#If i make changes to configurable parameter "dbc_max_pct" which is 50 now does this effect my Oracle Application Server 9.0.4 production environment.
#In case need to revert back old setting what backup to be taken and how to revert it back.
Note: Find an attach file which highlight top/swapinfo/iostat/vmstat info.
Have a good day to all........
Regard's
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тАО04-25-2010 11:32 PM
тАО04-25-2010 11:32 PM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
you 80 % swap is already used, it shows that you have pageouts and there must be a memory crunch.
Before reducing the dbc_max_pct, you can check the usage of the parameter.
Do you have glance installed ?
if yes , check what is the current usage for buffercache.
What is the current buffer cache read write hit ratio, is that utilized?
when it was noticed for first time?
Is there any io issue , disk issue,
If you have kmeminfo, it will tell you where the memory is used (but log a case with HP if you have support )
Regards,
Sooraj
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тАО04-25-2010 11:33 PM
тАО04-25-2010 11:33 PM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
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тАО04-25-2010 11:38 PM
тАО04-25-2010 11:38 PM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
dbc_max_pct kernel parameters. Your dbc_max_pct was probably
set at the default value of 50%, so it is consuming half of
your RAM over time, thus slowing performance and using memory.
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тАО04-25-2010 11:47 PM
тАО04-25-2010 11:47 PM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
dynamic kernal parameter deosnt require reboot to take effext.
Regards,
Sooraj
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тАО04-25-2010 11:48 PM
тАО04-25-2010 11:48 PM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
Regard's
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тАО04-26-2010 02:10 AM
тАО04-26-2010 02:10 AM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
Hopefully you'll be able to use more of RAM for your Oracle database. 50% is just too high.
>In case need to revert back old setting what backup to be taken and how to revert it back.
There will be no need to change it back. But you just do the same thing and change it to 50.
>Sooraj: dynamic kernel parameter doesn't require reboot to take effect.
This is 11.11, I don't think they are dynamic.
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тАО04-26-2010 04:09 AM
тАО04-26-2010 04:09 AM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
I appreciate your response to my query, I will go ahead with the dbc_max_pct=20 of 8GB.
Hope while rebooting it will not effect any process.
does a /stand/vmunix backup is a safety to revert back incase of any failure.
Why i am more concern is that , this is a prodution server and it is building new kernel while making changes to dbc_max_pct.
Regard's
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тАО04-26-2010 05:40 AM
тАО04-26-2010 05:40 AM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
I was in a doubt ( so I put a common sentence :) ). I know in 11.23 its immediate. But I couldnt loggin 11.11 and check.
Thanks :)
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тАО04-26-2010 06:27 AM
тАО04-26-2010 06:27 AM
Re: swapinfo -tam HIGH (dbc_max_pct=50)
booting from previous kernel will give you old settings.
1. It is recommended to take latest ignite before you make any changes.
2. Its always better to take a reboot before making any changes to ensure the server is booting fine currently. This will help you to isolate if any issues after the change.
Regards,
Sooraj