Explain layers and instances with explain???

Answer Posted / kanwal

SAP instance is usually a group of resources such as memory,
work processes etc that are usually in support of single
application server with in a client server architecture.
There may be many instances for one application server.
For each instance we have:
1. different system profiles.
2. different OS level users.
3. Different working directory.
4. separate communication entries are made in the host.

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