Memory Structures

Oracle uses memory structures to buffer data, execute code, and share data among Oracle and user processes. There are three categories of memory structures:

  1. System Global Area (SGA), consisting of:

    • Database buffer cache

    • Redo log buffer

    • Shared pool, consisting of:

      Library cache (shared SQL area)
      Dictionary cache
      Control structures

  2. Program Global Area (PGA)

  3. Sort area

The Section 10.3 section, later in this chapter, describes these categories in some detail.

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