| To correct the problem, try one of these actions: - confirm that the host and SID names for the database exactly match the values in the HOST_NAME and INSTANCE_NAME columns of V$INSTANCE. - confirm that you have not created two or more databases with the same connect identifier. That is, multiple databases in the broker configuration should not indicate the same physical database. - if you had performed a failover and have re-created your old primary database (or a standby database that had to be re-created), make sure the Data Guard broker configuration files have been removed for that database. Do NOT remove the configuration files that are in use by the new primary database.
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