The following is the ORA-16623 error message, you can learn the cause and solution of the Oracle database error.
ORA-16623 stale DRC UID sequence number detected
Cause: This status is returned when the Broker detects a stale sequence value during bootstrap or during health check. The sequence value is changed each time a role change occurs. A site that is unavailable for the role change operation will end up with a stale sequence number. Should that site attempt to rejoin the configuration, the broker will determine that it missed a role change and disable that site. The broker permanently disables the site since it may no longer be a viable standby site for the new primary.
Solution: Examine the configuration and the sites that were permanently disabled to determine if they require manual intervention.
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