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The User Global Area (UGA) is a memory area (RAM) that holds session-based information.

[edit] Dedicated Server

When running in Dedicated Server mode (one session = one dedicated process), the UGA is stored in the PGA (process global area).

[edit] Shared Server

When running in Shared Server mode (MTS with shared servers and dispatchers), sessions can be served by multiple server processes. As a result, the UGA cannot be stored in the PGA, and is moved to the SGA (shared global area).

[edit] Also see

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