Difference between UGA, PGA and SGA in oracle

please tell me what is the difference between UGA, PGA and SGA in oracle in the simple layman language
thanx in advance

UGA
The User Global Area (UGA) is a memory area (RAM) that holds session-based information.
Shared Server Area
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).
Dedicated Server
When running in [[Dedicated Server]] mode (one session = one dedicated process), the UGA is stored in the [[PGA]] (process global area).
i have question......
how to check and monitor the cpu usage ,temporary and memory usage in db?
ple could any body explain me.................
Edited by: 821205 on Dec 20, 2010 7:59 AM

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