Database - RAC/Scalability (MOSC)

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Oracle memory usage on Linux server

edited Sep 17, 2015 10:00AM in Database - RAC/Scalability (MOSC) 4 commentsAnswered

Hi Experts,

We have Linux 64 bit RAC servers of RAM 64 GB.

We allocated 12 GB to oracle instances on that server, but at OS level I am seeing all memory have been used.

When I executed TOP command I saw following output.

Mem:  65831132k total, 64053164k used,  1777968k free,   922328k buffers

Swap: 50331640k total,  1409072k used, 48922568k free, 52714116k cached

When I executed free command I saw following output.

$ free

                                      total            used                 free     shared    buffers     cached

Mem:                             65831132   64088488    1742644          0     922456   52702448

-/+ buffers/cache:                               10463584   55367548

Swap:                              50331640    1409068   48922572

But for oracle instances in total  we allocated 12 GB RAM.

I am not getting any idea  where rest of memory is. When I asked system admins they are also saying that all memory is used. But that RAC server is completely dedicated for Oracle instances not for any other programs.

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