Memory behaviour for Oracle Server 9i & 10g

I need to know why if you are telling to the OS that your Oracle's instance is going to use 500Mb, sometimes it takes even the whole memory with a lot of processes.
Can anyone explain to me this behavior?.
Thank you.
Cecilia.
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Your instance requires an SGA which is shared across all processes. The SGA is usually assigned a big chunk of memory up front.
Your user-oriented 'server' processes also have their own 'working memory' for sorting and other stuff. The more server processes, the more working memory will be allocated.
If you want more detail, there is a whole chapter on memory in the Oracle Database Concepts manual for whatever version you are working with.

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