I was reading the Oracle 12c concepts manual. Then I realised that something is not "technically" explained. Below is an excerpt of paragraph 22.214.171.124:
When a database is closed as part of a SHUTDOWN with any option other than ABORT, Oracle Database writes data in the SGA to the data files and online redo log files. Next, the database closes online data files and online redo log files...... After the database is closed, Oracle Database unmounts the database to disassociate it from the instance.
I don't technically understand what happens for those two sentences in bold above. Any ideas?
I don't know the whole process but I believe that when a file is closed, the OS or the program takes it off the RAM. I can't quite align that with the bold sentences above.