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Former Member

Listner on Dialog instance

Dears,

I want to know,Is listner exist on dialog instance also or it exist only on central instance.

If it does not exist in dialog instance then how this instance communicate to database means in this it would be communicating to central instance and that will be updating data in database.So please clear its communication process.

Shivam

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    Former Member
    Mar 26, 2009 at 08:29 AM

    Hi,

    Listener does not exist on dialog instgance & Central instance (if isolated from DB). It exists only on DB instance.

    Application server has oracle client installed on it where tnsnames.ora exists which has the DB server information and it connect to DB.

    Regards,

    Sachin Rane.

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    • Former Member Former Member

      Hi Shivam

      SAP has only one database connected to it..

      All your application servers are connected to the central Instance and they dont have a seperate database.

      When you start up an R/3 System, each application server registers its work proceses with the database layer, and receives a single dedicated channel for each. While the system is running, each work process is a user (client) of the database system (server). You cannot change the work process registration while the system is running. Neither can you reassign a database channel from one work process to another. For this reason, a work process can only make database changes within a single database logical unit of work (LUW). A database LUW is an inseparable sequence of database operations.Consequently, a work process must open a separate database LUW for each dialog step. The work process sends a commit command (database commit) to the database at the end of each dialog step in which it makes database changes. These commit commands are called implicit database commits, since they are not explicitly written into the application program.

      Hope this helps

      Rohit

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    Former Member
    Mar 26, 2009 at 11:14 AM

    Shivam,

    Please find more info about listner in the link below.

    [http://download-east.oracle.com/docs/cd/B10501_01/network.920/a96580/listener.htm]

    Hope this helps.

    Manoj

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