ORA-16002: database already open for read-write access by another instance

oracle

ORA-16002: database already open for read-write access by another instance
Cause: The database has been opened for read-write access by another instance, and cannot be opened for read-only access by this instance.
Action: This instance must be opened for read-only access, or all other instances must first be shut down and re-opened for read-write access.

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