Where is PGA located?

Hi Anyone can help me
where is PGA located in dedicated and shared server?

PGA (process global area or private global area) is memory that is allocated to the server process. This is always true. It's memory that is private to the server process, and is not shared at all.
The difference between dedicated and shared server comes with regard to the UGA (user global area). UGA is the session state. It's memory that contains information related to the current session. In dedicated server, where there's a one-to-one relationship between process and session, the UGA is a sub-heap of the PGA. However, in the case of shared server, anytime a session is active, (i.e., not idle, in the process of making a database call) it could be associated with any arbitrary server process. So, in this case, the UGA can't be in the PGA, cause if it was, a session would lose it's state between database calls, when the session got assigned to a different server process. So, in the case of shared server, the UGA heap is allocated in the SGA (in the large pool). This way, it's available for the session, regardless of which server process is currently servicing the session.
Hope that helps,
-Mark

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