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RE: what is in the UGA?

From: Steve Adams <>
Date: Mon, 10 Nov 2003 23:54:24 -0800
Message-ID: <>

Hi Ryan,

The words "session specific" have to do with the difference between a process and a session. Many Oracle environments run with just one user session per process, but in general there can be multiple user sessions being serviced by a single process.

The UGA holds persistent data structures that are specific to a particular session (even though other sessions may be connected through the same process). By contrast, the PGA contains persistent data structures that are specific to the process (not general to the instance) but must be visible to all sessions connected via that process, and the CGA holds transient data structures that are only required for the duration of a single call.

The UGA consists of a small fixed area containing a few atomic variables, small data structures and pointers. The rest of the UGA is a heap. Most of the UGA heap is for private SQL and PL/SQL areas. So yes, package variables and bind variable are there (although the bind meta-data is in the SGA) but sort areas, row source buffers, and runtime state data are also major space consumers.

@ Regards,
@ Steve Adams
@ - For DBAs
@ - For all

-----Original Message-----
Sent: Tuesday, 11 November 2003 12:14 AM To: Multiple recipients of list ORACLE-L

I cant find any specifics in the docs. I must be missing something. All I see is 'session specific information'?

Does this mean package variables? SQLPLUS bind variables? What does this mean?

Please see the official ORACLE-L FAQ:
Author: Steve Adams

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Received on Tue Nov 11 2003 - 01:54:24 CST

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