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need information about memory return by FREE and used by oracle.

edited Mar 24, 2009 5:37AM in Database Administration (MOSC) 2 commentsAnswered
  hi,
I have a linux 64 server with 8GB of ram and 3 instances with a sum of sga is 5228
when  I use free command, I see the linux cache+buffer  size is very high why ?

Does the Oracle internal cache appears in the system 'cached' memory ?
If yes, why is it not in 'used' memory ?


More informations :
The 3 instances are configured with filesystemio_options set to SETALL (so oracle use directio and don't use linux cache ???)
this is the configuration of sga for my 3 instances :
Does the Oracle internal cache appears in the system 'cached' memory ?
If yes, why is it not in 'used' memory ?

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