What are the differences between application server and
central instance?

Answer Posted / kishen

The main difference between app server and CI is that the
former has message server that communicates with DB and
remaining app servers and also CI posses Enqueue work
process. An App server is a dialog instance meant for
serving the requests by interacting with DB through msg
server of CI. CI need not necessarily contain DB, both can
be in different systems, but in most environments DB and CI
will be in a single box called "DBCI".

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