Database Administration (MOSC)

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Need an advise on the SGA?

edited Jun 15, 2018 3:55PM in Database Administration (MOSC) 6 commentsAnswered

I have 5 instances with SGA size totalling 5 GB.  My Linux free commands show this:
[root@........ ~]# free -mt
             total       used       free     shared    buffers     cached
Mem:          8092       7934        158          0        194       5717
-/+ buffers/cache:       2022       6070
Swap:         7999       1511       6488
Total:       16092       9445       6647

Please explain why 6 GB is free, and how much memory is available for a new database.

My Database is 10.2.0.4 and OS linux 86X-64,I have 5 instances with SGA size totalling 5 GB. My Linux free commands show I have 6 GB available.  The system only has 8 GB physical.  So, I need an explanation has to how to figure out how much memory is available for another database based on the free command, and how to determine how much SGA is currently being consumed.

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