Central instance and SAP instance

[former_member199632]

hello,

Im confusing with Central Instance (CI) and SAP instance (Application Instance)

According to my understanding, i think SAP instance is running on all the Aplication servers. (if having 4 Application servers, in all those servers, SAP instance is running concurrently)

But Central instance is running on 1 of the Application servers only.

- How will the SAP decides on which Application should run the central instance.

Will that CI change automatically time to time.... or do we need to allocate 1 Application server as CI server, when doing the installation.

Is there any relationship between Message server and Central instance.

Does CI contains message services and enqueue service...

plz help me to reslove these issues

Rgds,

Edited by: zerandib on Apr 25, 2010 10:45 AM

[Former Member]

Hi

IF you are having multiple application servers and CI then initially when user loged in then all requests goes to the instance on which user is logged on ( string u have used in sap gui). IF u want system should to all load balancing automatically then you have to use the logon groups.

Regards

Bajrang Saini