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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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LEARN ABOUT SUNOS

delete-http-listener

asadmin-delete-http-listener(1AS)				   User Commands				 asadmin-delete-http-listener(1AS)

NAME

       asadmin-delete-http-listener, delete-http-listener - removes the HTTP listener

SYNOPSIS

       delete-http-listener  --user admin_user[--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename]
       [--terse=false] [--echo=false] [--interactive=true] httplistener_ID

       Removes the HTTP listeners. This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --passwordfile	       file containing the domain application server password.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

OPERANDS

       listener_id	       listener ID of the HTTP listener.

       Example 1: Using delete-http-listener

       asadmin> delete-http-listener --user admin1
       --password adminadmin1 --host pigeon --port 5001 sampleListener
       Deleted http listener with id = sampleListener

       Where: sampleListener is the HTTP listener deleted.

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-http-listener(1AS), asadmin-list-http-listeners(1AS)

J2EE 1.4 SDK							    March 2004					 asadmin-delete-http-listener(1AS)
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