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Full Discussion: Reason/components behind high memory utilisation on linux
Operating Systems Linux Reason/components behind high memory utilisation on linux Post 302695111 by bakunin on Saturday 1st of September 2012 10:46:45 AM
Old 09-01-2012
It is obvious that Oracle takes most of the memory available. When Oracle starts the DB it takes a configurable amount of memory, the SGA (system global area). It does its own sort-of file caching in there (DB block buffers, ...) as well as memory-intensive operations (indexing, ....). The SGA is so-called "pinned memory", that means it is not swapped out under any circumstance.

Apart from that Oracle has separate processes by which it communicates with the outside world: the "listeners". In your "top" output these are the processes with "(LOCAL=NO)" at the end. Every listener needs some memory too and this might add up to something. How many instances of a listener process are started depends on the load on the database (if there are less DB connections there will be less listener processes), but is also configurable somewhere in the DB startup files.

I have only some cursory knowledge about these things (I am a Sysadmin, not a DBA, after all), but your DBA can probably off the top of his head explain these things in detail to you. I suggest you set together with him/her and discuss these issues.

I hope this helps.

bakunin

/P.S.: Now that Jim mentions it, i believe he is right: the heap looks definitely fragmented and, yes, this can cause problems.
 

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NNTP-PULL(1)							 nntp-pull manual						      NNTP-PULL(1)

NAME

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SYNOPSIS

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DESCRIPTION

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EXAMPLES

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SEE ALSO

       sinntp(1)

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