Answer / abhilasha

Central instance is same as a dialog instance.Only it has
additional processes like message server and enqeue
server.thats why it is called as a central
instance.Otherwise no difference

Answer / shahid

In central instance we have the messenging server the msg
server is responsible to communicate with the database,
in application server there will be dispathcher who is
responsible for appl server to central instance
communication.

Answer / inder09

Central Instance need to have Message Server with 5 work
processes as follow
Message Server with DIA+BGD+ENQ+V1+SPO

Minimum work processes needed for a SAP server?
DIA:2{Every dispatcher requires at least two dialog work
process}
BGD :2{At least two background work process, can configure
more than one per dispatcher}
ENQ:1{Only one enqueue work process is needed for each system}
Update(V1):1{At least one update work process, can have more
than one per dispatcher}
SPO :1{At least one spool work process, can have more than
one per dispatcher}

Message Server,Gateway Server and ICM these r not work processes
these r services

Answer / 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".

Answer / ravikumar suru

The Central instance is administrative unit that combines
all the components of sapsystem providing one or more
services to process user request, the component of central
instance are dispatcher, dialog,update,enqueue,batch,spool
with services like massage server,gateway service. The host
on which CI is configured is called as application server
so "CI and Application server both are one and the same".

Answer / robin

CI contains Message service and Enque service but also
having Dialog, V1 and V2, Spool and BTC

But App. will not have the Message and Enque

App. server requires only when there is a concept called
logon load balance....without which there will be no use
with App.server.

All the time when the user try to loggin into SAP by using
logonpad, the user will get connect to CI only, since CI
contains Message Server, it will redirect the user request
where the resource available, means where the more dailog
processes are in waiting state.....whether in APP1 or APP2.

Answer / gopi.m

Application Server:
Application Server is a collection of Dialog Work process
which is maintain for the load balancing for the End user

CI:
is the combination of Database instance and Disptatcher and
Message Server,Enqeue Server.
Which is running under one SId

Answer / sekhar

Hi,

The Central Instance will have the all the worker
processors like 1.dialog 2.background,3.enque 4.message
server and 5.spool work processor.

where as appliction server will have only dialog and
background work process

Answer / ashish hans

ABAP application server execute abap application and
communicate with presentation component and database using
message server.ABAP application server include
dispatcher,gateway and shared memory.


central instance is a work area where message server,enque
work process execute.

Answer / apurv anand

sap application is application server for user, in which we have any server's, among of them like basis.

central instance is like dialog instance, perform same usual like dialog. but it consists extra components like, enque and message server, before requesting to server, dialog instance communicate to central instance. after that request move to server.

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