What does the error message ORA-01033: ORACLE initialization or shutdown in progress 01033. 00000 mean in Oracle 19c?

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The error message ORA-01033: ORACLE initialization or shutdown in progress 01033. 00000 means that the requested operation cannot be completed because either the Oracle instance is starting up or shutting down. This error can happen in various situations such as during database startup, when the database is being shut down, or when some other system process is accessing the database. The user should wait for the initialization or shutdown process to complete and try again. If the problem persists, the user should check the Oracle alert log and the system logs for additional information.