In this state, the DBA can perform only certain types of database administration.
For example, the DBA may have moved or renamed one of the database files. The
datafiles are listed in the control file but aren??™t open in the MOUNT state. The
DBA can issue a command (ALTER DATABASE) to rename a datafile. This
command will update the control file with the new datafile name.
3. Opening the database. The instance opens the redo log files and datafiles using
the information in the control file. At this point, the database is fully open and
available for user access.
Shutting Down the Database
Logically enough, the process of shutting down a database or making it inaccessible
involves steps that reverse those discussed in the previous section:
1. Closing the database. Oracle flushes any modified database blocks that haven??™t
yet been written to the disk from the SGA cache to the datafiles. Oracle also
writes out any relevant redo information remaining in the redo log buffer. Oracle
then checkpoints the datafiles, marking the datafile headers as ???current??? as of
the time the database was closed, and closes the datafiles and redo log files.
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