on 03-02-2013 8:19 PM
hi can some one tell me what is the difference between application instance and dialouge instance?and what is the use of central instance?
Dialog instance and Application Server are generally used synonymously.
A SAP instance is basically an administrative unit providing one or more services. Check the below summary:
ABAP AS
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Dialog Instance = Instance where dispatcher run with other work processes like dialog, background, spool etc
Central Instance for AS ABAP = Message Server + Enqueue work process
Central Services Instance for AS ABAP (ASCS) = Message Server + Enqueue Server (when high availability is used)
http://help.sap.com/saphelp_nw04s/helpdata/EN/43/e6b0a0d7633886e10000000a1553ed/content.htm
Central System = Database + Central Instance
Java
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Dialog Instance = Java dispatcher (without SDM)
Central Instance for AS JAVA = SDM + Dialog Instance (Where SDM runs)
Central Services Instance for AS JAVA (SCS) = Message Server + Enqueue Service
Central System = Database + Central Instance + Central Services Instance
ASCS standard for ABAP SAP Central Services.
SCS standards for SAP Central services.
You can read following also.
http://help.sap.com/saphelp_nwpi711/helpdata/en/47/fe7aa040e23c8be10000000a42189c/content.htm
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Hi Srikanth,
Application Server & Dialog instance are the ones where you will have processes like DIA, BTC, SPO, BGD , UPD1, UPD2. It can be used for enduser logins.
Central instance is the one where you will have processes like ENQ in addition to DIA, BTC, SPO , BGD, UPD1 and UPD2. Central instance will also host message server in addition to above processes.
When a user logs into SAP system using SAPgui his request first goes to central instance ( message server service), which decides which work process this request should be allocated.
Hope this helps.
Regards,
Deepak Kori
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