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UGA, the user global area

This part of the memory is responsible to store information related to sesssions.
In dedicated server mode, the UGA is a part of the PGA.
In shared server mode, the UGA is part of the shared pool (which in turn is part of the SGA).

Cursor work heap

The memory according to hash_area_size and sort_area_size is allocated within the UGA.

Memory leaks

Memory leaks in the UGA are reported through a ORA-00600 [729].