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Difference between DB_NAME and Instance_Name
P11_QUESTION_ID:533422350794)
A database is a set of files (data, redo, ctl and so on)
An instance is a set of processes (SMON, PMON, DBWR, etc) and a shared memory segment
(SGA).
A database may be mounted and opened by many INSTANCES (Parallel Server) concurrently.
An instance may mount and open ANY database -- however it may only open a single database
at any time.
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