Whole Oracle database in memory -


suppose have oracle database data files 256 gb in size. idea use server with, say, 384 gb ram in order host entire database in ram?

is there difference if have, say, 128 gb ram?

i'm talking caching , oracle inner workings, not memory based filesystem. suppose oltp, , 100 gb working set.

regards,

use views v$sga_target_advice , v$pga_target_advice predict performance improvement of additional memory.

oracle records many statistics physical (disk) , logical (total) i/o requests. people used obsess on buffer cache hit ratio. can helpful number doesn't tell whole story. if ratio 99% cache sufficient , adding more memory won't help. if it's low might benefit more memory, or perhaps processes use disk aren't time critical.

be careful before request more memory. i've seen lot of memory wasted because people assume more memory solve everything. oracle has many i/o features reduce memory requirements. "in-memory database" fad hype.


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