Latest SAP DB interview questions

Explain data quality in SAP.
Differentiate between SAP memory and ABAP memory.
Explain RMAN. Can it be used for database recovery and backup? If ye, how?
DOes C-API exist to access SAP DB?
Differentiate between support packages and kernel upgrade.
Situation: I used "Update" command without Where clause. What would happen?
Situation: You need a create a table with fields without referring to data elements. Is it possible? If yes, how?
Explain “Group by” in Select statement
How would you install multiple Central Instances on the same physical machine?
What is the select statement to read data into internal tables?