Database Operating Modes | Oracle Startup & Shutdown Sequence

Database startup: For any normal user to access the #database, the #instance has to be started up and it should mount and open the corresponding database. We term the entire steps as database #startup. In short, database startup includes the following steps:
1. Start an instance.
2. Mount the database.
3. Open the database.
Database Shutdown: During a database #shutdown we close the database and terminate the instance.
There are different modes to bring down the database:
1. Shutdown immediate.
2. Shutdown transactional.
3. Shutdown normal.
4. Shutdown abort.

00:00 Database Startup and Shutdown Modes
05:09 Database startup Phase
08:01 Database Shutdown Modes
11:46 Shutdown Database

[ramiganipurushothamreddy]

Alter database open;

Showing error:

Ora-0060 internal error code arguments :