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Former Member

what is central instance..........

hi,

I am new to the SAP . i want information about what is central instance and dialog instance. what are their roles in SAP System.

Regards,

sridhar M

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2 Answers

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    Former Member
    Dec 17, 2007 at 10:33 AM

    Hi Sridhar

    Though your question looks simple but i suggest to read following link

    http://www.oreilly.com/catalog/sapadm/chapter/ch01.html

    The central instance is a combination of hardware and software. It contains a physical server (the application server) and numerous software components, including a message server, a database gateway (a pre-established connection between SAP and Oracle--or another database), and various update, enqueue, dialog, and spool facility software. In most generic SAP architectures, there are numerous application servers but only a single central instance. However, in addition to managing the SAP interfaces, the central instance can also serve as an application server.

    hope its fine.

    Thanks..

    PS : Award points if helpful

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    Former Member
    Dec 17, 2007 at 10:37 AM

    cental instance is nothing but an application server which is having its own set of workprocess,dispatcher and its own buffer.CI is having enque work process,message service and gateway service,which will not be available in the remaining application servers.

    Enque wp controls the locking mechanism.

    Dispatcher:controls the requests,will put all the requests in queue and will assign the requests to the respected wp's.

    Dialog work process is for dialog users which runs in foreground.

    Reward points if answers your question.

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