listener procs: diehard
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Thread: listener procs: diehard

  1. #1
    Join Date
    Nov 2000
    Posts
    89
    Oracle People:

    I recieved a good tip from dbasupport to try the PROFILES with "resource_limit" and "IDLE_TIME". Thats great but 2 problems have occured:

    1.) Once the user is killed by "IDLE_TIME" timeout his listener process remains untill he attempts another action:

    -------
    oracle 22701 22700 0 10:09:12 ? 0:00 oraclefreddy (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    -------
    So I get stuck with ghost listener procs even though I got rid of the user.

    2.) I try to use my brain and think- OK try to find the way to timeout listener procs. So I try the following which doesn't seem to kill off the ghost listener procs:

    edit listerner.ora:
    ---------------------------
    (SID_DESC =
    (GLOBAL_DBNAME = freddy)
    (ORACLE_HOME = /u00/app/oracle/product/8.1.7)
    (SID_NAME = freddy)
    (PRESPAWN_MAX = 99)
    (PRESPAWN_LIST =
    (PRESPAWN_DESC =
    (PROTOCOL = TCP)
    (POOL_SIZE = 10)
    (TIMEOUT = 5)
    )
    )
    ----------------------------------

    I guess I guessed wrong and this timeout is only for prespawned procs. If so ...

    How do I automatically get rid of listener procs that hang around after the user is killed. This is bad because I seem to get these ghost procs from web servers.

    Thanks,

    Roger

  2. #2
    Join Date
    Nov 2001
    Location
    Sheffield, England, UK
    Posts
    78
    Ghost listener processes from redundant connections?

    I think you're referring to the wrong thing here. Once the listener has passed your connection through to the database, it goes back to listening for other potential connections.

    There will be no continuing interaction between your created user session and the listener.

  3. #3
    Join Date
    Aug 2001
    Location
    Waterloo, On
    Posts
    547
    Originally posted by rogerF:
    Once the user is killed by "IDLE_TIME" timeout his listener process remains untill he attempts another action:
    There is no 'dedicated' listener for each user. Listener only runs on the host and there is generally only one listener process running in the server for all user connections connecting to a particular db from a particular port.

    I think you are confusing issues here. Do you mean dedicated server process?


    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

  4. #4
    Join Date
    Nov 2000
    Posts
    89
    Apologies !

    I used the wrong terminolgy. I realize there is 1 listener. I meant that the process that shows up in the Unix proc table shown with "ps" remains after the user is "killed" from the SQL prompt:

    ---------------------------------------------------------
    oracle 6763 6762 0 16:28:17 ? 0:00 oraclefreddy (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    ---------------------------------------------------------

    When the remote client attempts another action( which he often does NOT do(think ghost web procs) ) the process shown in the Unix ps command die.

    Rational ClearQuest web is "known" to leave these wonderful little procs and I must deal with it :-) Using the IDLE_TIME helps but doesn't kill the Unix proc untill the user attempts another action- Ghost web procs don't attempt later actions.

    So I need to get rid of(auto) the procs that remain despite that they have been killed in SQL with alter kill session.

    Thanks,

    Roger


  5. #5
    Join Date
    Oct 2000
    Posts
    467
    Probably PMON has not cleaned up the user processes which are no longer active.
    You can kill them at the os level or by alter system kill session command.
    Vinit

  6. #6
    Join Date
    Sep 2001
    Location
    Makati, Philippines
    Posts
    857
    just to follow up VINIT's post:

    PMON is yet to clean that process that just been killed in sql.
    So if you are going to wait a little longer let's say 3-5mins, then PMON will do the cleanup operation.

  7. #7
    Join Date
    Nov 2000
    Posts
    89
    Vinit:

    I thought the same ... but there is a problem. My scripts that show the users show the Unix proc id#. The web connections don't show as Unix proc# - just the port #:

    -------------------------------------------------------
    CQ05 / cqweb dllhost.exe-NTS31(ERDSE087\NTS 13/53909 INACTIVE 1632:296 22-NOV-2001:15:53:28 19:35:59
    31 ) /
    22-NOV-2001:15:54:07
    -----------------------------------------------------

    This previous is the result from a script that uses:
    V$SESSION

    As you see the "Unix process" is shown as "1632:296" which are the port numbers NOT the Unix procs. The script does however work to show "Unix Procs" when run on a normal(non web) sql connections as shown here:

    --------------------------------------------------------
    ROGER / oracle sqlplus@ora04.era-a.ericsson.s 12/9327 INACTIVE 17024 23-NOV-2001:11:33:34 00:00:28
    e (TNS /
    V1-V3)-pts/3(ora04.era-a.erics 23-NOV-2001:11:33:33
    son.se)
    -------------------------------------------------

    So, the problem is that I can't identify the correct Unix procs to kill off when dealing with web connections that leave Unix procs after being killed with kil session.

    Catch 22 - Rational says I should kill them manually but I can't readily identify them. If they were normal SQL connects I could easily see the Unix Proc and create a script to cleanup.

    This is a bit strange but a real problem.

    -Roger





  8. #8
    Join Date
    Feb 2001
    Posts
    389
    1) Web or No Web, each Oracle connection has to have a Server process created at OS level and hence
    for both cases there has to be a corresponding OS PID , unless u r using Application Server
    connection pooling than one connection serves many sessions.

    So the only problem which i can think of is if u r not using connection pooling and using single common
    Oracle account for all Web connections, then how to identify which Oracle session points to which
    Web connection.This is an application development issue , use dbms_session.Use this to identify.

    And Port number u found on OS should be common for all connections , since it would be for listener
    if u rusing Listener.

    Also Why would PMON care to clear up OS hung process, it just cleans up Oracle sessions after crash/killed.

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