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



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

Answer / guest

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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