In SAP landscape, we have only one central instance and we may have more than one application servers entirely depends on number of users.CI has both Message server and Enque server where as application server doesnot have this.when ever any new request will come message server will process the request as per load balancing work process whether it is for CI or application server.Enque will keep other incoming request in queue and follows the locking process.This is the approach followed by both CI and application servers.
Bluesky
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