A normal shutdown of an Oracle database is actually rarely used. This is because the normal shutdown waits for everyone to complete their work. When a normal shutdown occurs, the database is closed in a normal manner, and all changes made in the database are flushed to the database datafiles.
SQL> shutdown
When you execute a shutdown, Oracle will flush all the changes in memory out to the database datafiles. This makes database startup quicker because the database is in a consistent state.
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