A program global area (PGA) is a memory region that contains data and control
information for a server process. It is a nonshared memory created by Oracle when a
server process is started. Access to it is exclusive to that server process and is read and
written only by Oracle code acting on behalf of it. The total PGA memory allocated by
each server process attached to an Oracle instance is also referred to as the aggregated
PGA memory allocated by the instance.
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