Oracle 11g memory_target best practices

Hi expert.
I'll use memory_target in my oracle 11g enviroment. There is a best practices, or formula, for to choose my memory_target?
There is a memory_target limit? (for example 128gb)
Many thanks

Thanks for the replies.
I could like know if there are some criteria, or formula, to a correct memory_target set.
I'm reading the file OracleOLTPonDellEqualLogicPS60x0.pdf
>
http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBQQFjAA&url=http%3A%2F%2Fwww.delltechcenter.com%2Fpage%2FSizing%2Band%2BBest%2BPractices%2Bfor%2BOracle%2B11g%2BOLTP%2Bon%2BEqualLogic&rct=j&q=OracleOLTPonDellEqualLogicPS60x0.pdf&ei=7av3TPP_J4yb4Ab_7pnzBg&usg=AFQjCNF9PfDrIP-VkYq_v3qPx03UAdkF9Q&sig2=pAF4A7E-S_FJkQ8jxsiWmw&cad=rja
>
that explain the best practices for an Oracle RAC 11g on Dell Server. About the Tuning Parameter I don't undestand very well what's the criteria for to choose the MEMORY_TARGET between 32,40 or 48GB
Maybe choose what's the correct memory value for my server? I've an machine with X gb of RAM that I can allocate for an oracle istance. There is a fisical limit MEMORY_TARGET?
Thanks for all suggest.
Cheers,
Lain

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