Answer / cspriyadba

There are 2 basic memory structures on the Oracle Instance

1. System Global Area (SGA)
2. Program Global Area (PGA)

Answer / azhar505@gmail.com

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.

Answer / guest

ORACLE MEMORY STRUCTURES

software code area:-software code area are partitions of
memory used to store code that is being or may be executed.

system global area:-it is a group of shared memory
structures that contain data and control information for one
oracle database instance

database buffer cache
redo log buffer
shared pool

program global area:-it is a memory region that
contains data and control information for server process

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