Page cache

Posted by satish on Jun 19, 2019; 5:44am
URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/Page-cache-tp7432.html

Dear Erman,

We are running 12.1.0.2 oracle database on redhat linux 7.Please clarify

1)What is the use of cache?
2)Will this reduce the physical reads by holding frequently accessed data blocks?
3)If yes,we have SGA for the same purpose right?
4)Will this cache gets the memory from ram or disk?

$ free -m
             total       used       free     shared    buffers     cached
Mem:          2026       1922        103          0        491       1109
-/+ buffers/cache:        322       1703
Swap:         4094          0       4094

Thank you