Operations that can be performed in MOUNT and MOMOUNT state

Hello I need to understand this basic. I need to know what different type of operations can be performed in both MOUNT and NOMOUNT when one starts the database?
Thanks!

That depends on what Oracle does in both states :
- in NOMOUNT state the instance is started and the init file (pfile or spfile) is read, but no information are known yet about the database structure (which are within the controlfile). This is the situation, for example, of a new database creation. You can change initialization parameters, or re-create the controlfile, but no actions can be performed on the existing database.
- in MOUNT state the controlfile is read, and now the instance is aware of the database structure. You can do maintenance operations (e.g. changing from noarchivelog to archivelog and viceversa, making a full cold backup, changing datafiles location, and so on), but no user data can be read : to do this one the database must be OPENed.

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