Answer / guest

Cause: A request to create a Data Guard configuration was
made while connected to a database that is part of an
existing configuration.

Action: Delete the existing configuration if you want to
create a new configuration.

Please add more information about this Error

LRM-00120: 'string' is not a legal Oracle number for 'string'

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ORA-23485: Column group "string" must consist of a single numeric column only

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TNS-00256: Status of Navigator:

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TNS-12502: TNS:listener received no CONNECT_DATA from client

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ORA-32306: updatable materialized views with user-defined types must use SELECT *

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ORA-02024: database link not found

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