Answer Posted / ashwin mane
A SAP Instance is all the components created by the sapinst
program who all share the same database.
There are three sub-Instance.
1. Database Instance.
2. Central Instance.
3. Diaglog Instance.
Sap works on Three layers.
1. Presentation Layer. Ex.-WinXp
2. Application Layper. Ex.-Sap Ecc 6.0
3. Database Layer. Ex.-Oracale, MSSQL
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