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SGA.. fixed size and variable size

Posted on 2006-10-24
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Last Modified: 2007-12-19
Hello,

I am trying to understand how Oracle uses memory structure for tuning purpose.  For that I ran a simple select against V$sga and like to know:

- What is the fixed size?
- What is the variable size?  

 area in the SGA.

How are these two areas in the SGA calculated? And, what is there use?

Thanks.

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Question by:mohammadzahid
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by:mohammadzahid
ID: 17799407
Sorry, here is the output of the V$SGA from my local XP system. Values represented are default values of Oracle when created/installed.



SQL> select * from V$sga;

NAME                     VALUE
-------------------- ---------
Fixed Size              454644
Variable Size        109051904
Database Buffers      25165824
Redo Buffers            667648

total SGA size  SQL> select sum(bytes) from V$sgastat;

SUM(BYTES)
----------
 135328756
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Pierrick LOUBIER earned 500 total points
ID: 17800024
Have a look at this excellent article written by guru Tom Kyte : http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:365088445659
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LVL 11

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by:mohammadzahid
ID: 17800085
Thanks for forwarding a great link. This link answered all my questions. There is a reason Tom Kyte is an Oracle guru. :-)
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