The instance mounts a database to associate the database with that instance. To mount the database the instance control files and opens them.Control files are specified are in the CONTROL_FILES initialization parameter in the parameter file used to start the instance.Oracle then reads the control files to get the names of the database's and redo log files. At this point, the database is still closed and is accessible only to the database administrator. The administrator can keep the database closed while completing specific maintenance operations. However the database is not yet available for normal operations.
How a Clone Database is Mounted.
A clone database is a specified copy of a database that can be used for tablespace point-in-time recovery. When you perform tablespace point-in-time recovery, you mount the clone database and recover the tablespaces to desired time, then export metadata from the clone to the primary database and copy the data files from the recovered tablespaces.
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