Hi,
An instance is a unit in a Java cluster, which can be started, stopped, and monitored separately.
The elements of an instance run on one physical machine. It is also possible to run several instances on one physical machine.
The minimal AS Java installation consists of:
1. A Java central instance with a dispatcher, a server process, and the Software Deployment Manager (SDM).
2. The Central Services instance.
3. The Database.
So CI(Central Instance) is an instance which is generally installed on a machine with high availability features
For more details you can visit
http://help.sap.com/saphelp_nw2004s/helpdata/en/2e/611724f410254ca12a3f396ec5ae85/frameset.htm
regards,
Sujesh
Message was edited by: sujesh kc
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