Memory target with Oracle 11g

Hello All,
I am using Oracle 11gR2 on AIX 7.1.
My question is about memory_target parameter with RAC, what I usually do is to put this parameter equal to 40% of the RAMs on the database server in single instance database.
With Oracle RAC, should it be 40% of the summation of RAM on all nodes? for ex if I have 2 nodes with 40 GB RAM on each node, so i can put my memory_target= 40% of (40+40)= 32 G ?? is that correct or it will be 40 % of the RAM on 1 node?? is it by Instance or by database ?
How do i know if a parameter is at the database level or instance level?
Regards,

NB wrote:
Hello All,
I am using Oracle 11gR2 on AIX 7.1.
My question is about memory_target parameter with RAC, what I usually do is to put this parameter equal to 40% of the RAMs on the database server in single instance database.
With Oracle RAC, should it be 40% of the summation of RAM on all nodes? for ex if I have 2 nodes with 40 GB RAM on each node, so i can put my memory_target= 40% of (40+40)= 32 G ?? is that correct or it will be 40 % of the RAM on 1 node?? is it by Instance or by database ?
How do i know if a parameter is at the database level or instance level?
Regards,Its _40 % of the RAM on 1 node_ recommended approach. Since Memory_target wil consume the memory of server, so rest 60% is available to OS to do his work. If you put 40% of (40+40) = 32 GB on each node then there is very little memory left for OS(you can see decrease in performance).
Its 2 node RAC, so each instance has its own set of parameter in pfile/spfile. So we can say its instance specific. Each node can have same of different values of memory_target parameter
Edited by: 909592 on Mar 7, 2012 7:04 PM

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BANNER
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PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
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pat2     varchar2(1000);
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vs        varchar2(1000);
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25000th execution
26000th execution
27000th execution
28000th execution
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30000th execution
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PARAMETERS USED BY THE OPTIMIZER
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================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

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100th execution
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__db_cache_size = 16777216
__pga_aggregate_target = 83886080
200th execution
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500th execution
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1200th execution
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