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Old 05-02-2013, 04:24 AM   #1
delkofi
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Recommended shared memory on Red hat 6.1 64bit


Hi

I have Linux Red Hat 6.1 which is used for Oracle 11g, the DBA wants to enable Automatic Memory Management (AMM) for 5 database instances. The current size of the shared memory is 32G with 1% used. The question is how much of that can be used to allocate to AMM? and how much needs to remain on the OS?

Thanks
 
Old 05-02-2013, 04:49 AM   #2
LuxLuv
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I think that you could go quite high. Depending if there is some other services running on that machine that could consume RAM.

I would go for maybe 24Gb to be on the safe side?

/Lux
 
Old 05-02-2013, 05:14 AM   #3
pan64
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yes, actually it depends on your needs, I would go as high as possible (as long the system will not slow down or have some strange performance or stability problems)
 
Old 05-02-2013, 08:54 PM   #4
grim76
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Keep in mind that Oracle typically performs better with HugePages. Especially with a large SGA. AMM and huge pages unfortunately don't work too well together.
 
  


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