Results 1 to 5 of 5
  1. #1
    Join Date
    Jan 2004
    Posts
    24

    Unanswered: what is virtual circuit memory area

    Hi All,

    I have some doubts regarding Listener process.
    Please clarify it.

    1.What is the difference between node and server
    Where the nodes are configured?

    2.Where is virtual circuit memory area located?

    3.What are connect identifiers?


    Thanks in Advance

    Regards
    Uma.Movva

  2. #2
    Join Date
    Nov 2003
    Location
    Bangalore, INDIA
    Posts
    333

    Thumbs up

    Hi,

    A process that resides on the server whose responsibility is to listen for incoming client connection requests and manage the traffic to the server.

    When a client requests a network session with a database server, a listener receives the actual request. If the client information matches the listener information, then the listener grants a connection to the database server.

    A configuration file for the listener that identifies the following for a listener:

    * Unique name
    * Protocol addresses that it is accepting connection requests on
    * services it is listening for

    The listener.ora file typically resides in $ORACLE_HOME/network/admin on UNIX platforms and ORACLE_HOME\network\admin on Windows NT.
    SATHISH .

  3. #3
    Join Date
    Nov 2003
    Location
    Bangalore, INDIA
    Posts
    333

    Thumbs up

    HI,

    Virtual Circuit Memory
    ---------------------------

    A piece of shared memory used by the dispatcher for client database connection requests and replies. The dispatcher places a virtual circuit on a common queue when a request arrives. An idle shared server picks up the virtual circuit from the common queue, services the request, and relinquishes the virtual circuit before attempting to retrieve another virtual circuit from the common queue.
    SATHISH .

  4. #4
    Join Date
    Jan 2004
    Location
    Hyderabad, India
    Posts
    37
    1.What is the difference between node and server
    Where the nodes are configured?

    In which context you are asking this?? If it is RAC, then we call each instance as a node. If we are using enterprise manager, then intelligent agent listens for more than one node ( node here means instance).

    So clarify where did u encounter this term...

    2. Where is virtual circuit memory area located?

    Dispatchers create virtual circuits for every connected client. These virtual circuits will be put in a queue and will be handled by a shared server. So the memory for these will be allocated from shared pool of SGA.

    3.What are connect identifiers?

    Connect identifier is nothing but service names. we will resolve the connect identifier depending the resolution method ( tnsnames / local naming etc. If we use tns names, we'll resolve the connect identifier from tnsnames.ora file in $ORACLE_HOME/network/admin directory.
    Regards
    Suneel

  5. #5
    Join Date
    Jan 2004
    Posts
    24
    Originally posted by suneel.kumar
    1.What is the difference between node and server
    Where the nodes are configured?

    I encountered nodes in bequeathed session,where it says
    In order for this method to be used ,the listener must be
    running on the same server as the node.

    I can not figure out what is the node in this context.

    Thank You

    Regards
    Uma.Movva


    In which context you are asking this?? If it is RAC, then we call each instance as a node. If we are using enterprise manager, then intelligent agent listens for more than one node ( node here means instance).

    So clarify where did u encounter this term...

    2. Where is virtual circuit memory area located?

    Dispatchers create virtual circuits for every connected client. These virtual circuits will be put in a queue and will be handled by a shared server. So the memory for these will be allocated from shared pool of SGA.

    3.What are connect identifiers?

    Connect identifier is nothing but service names. we will resolve the connect identifier depending the resolution method ( tnsnames / local naming etc. If we use tns names, we'll resolve the connect identifier from tnsnames.ora file in $ORACLE_HOME/network/admin directory.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •