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Oracle Instance is a combination of memory and background processes.
Types of memory strucutres.
1.SGA(Shared Global Area):This is chunk of memory allocated during instance startup.SGA contains data and control information for an oracle instance.SGA is shared by several background processes.
SGA contains
SHAREDPOOL,Database BufferCache,LogBuffer Cache.
JavaPool and Large Pool are optional memory structures.
2.PGA(Program or Private global Area):
Contains data and control information for each server processes.Unlike SGA,PGA is not shareable.There is one PGA for one server process.
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