Home » Server Options » RAC & Failsafe » Memory usage increasing on Oracle RAC (Oracle RAC 11g (11.2.0) three node RAC, RHEL 5.7)
Memory usage increasing on Oracle RAC [message #538917] Tue, 10 January 2012 06:30 Go to next message
Modaya
Messages: 10
Registered: September 2008
Location: Colombo
Junior Member
After the reboots each system was using around 30 GB of memory... now that it's been up for a week memory is up to 98GB used on each system. None of the systems are swapping.


Mem: 98999084k total, 97937116k used, 1061968k free, 774900k buffers
Swap: 16779884k total, 0k used, 16779884k free, 89510312k cached

any idea why this can happen or where to check ?

Thanks a lot...


Re: Memory usage increasing on Oracle RAC [message #538929 is a reply to message #538917] Tue, 10 January 2012 07:29 Go to previous messageGo to next message
John Watson
Messages: 8922
Registered: January 2010
Location: Global Village
Senior Member
You didn't say what your operating system is, but if it is (for example) Linux or AIX, any "spare" memory will eventually be used by the OS for caching. You should never have more than a small amount of free memory once the system has stabilized. I would hope that most OSs work like this. Afterall, if you aren't using it, you are wasting it.

[update: I just noticed that you did say RHEL. So there you go]

[Updated on: Tue, 10 January 2012 07:31]

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Re: Memory usage increasing on Oracle RAC [message #538949 is a reply to message #538929] Tue, 10 January 2012 08:41 Go to previous message
Modaya
Messages: 10
Registered: September 2008
Location: Colombo
Junior Member
Thanks John... Smile
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