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The Big Picture

Notes:

This is a review from the lesson Architecture, Part 1. In that lesson we focused on the operating system files. In Architecture, Part 2 you learned about the processes. In this lesson, we will discuss the memory areas illustrated here (shown as boxes).
Before we start, note that most of the memory areas are part of a larger area called the System Global Area (SGA). These areas are shared by all users of the database. However, the Program Global Area (PGA), is not part of the SGA. Each user (session) gets their own private PGA area.
We will discuss the purpose of these memory areas throughout the remainder of this lesson. Let’s get started…