Oracle Solution for Error ora-16620

ORA-16620: one or more databases could not be reached for a delete operation

What triggered the Error:

One or more standby databases could not be reached for either a DGMGRL CLI REMOVE DATABASE or a REMOVE CONFIGURATION command.

What should we do to fix it:

This typically indicates a network problem where the standby database is unable to respond to the primary database. In the event of this situation, examine the primary database Data Guard broker log to determine which standby databases could not be reached. For each standby database not reached, connect to that database and shut down the broker by setting the initialization parameter, DG_BROKER_START, to false. After the broker has been shut down for the standby database, locate the Data Guard broker configuration files from the standby database DG_BROKER_CONFIG_FILE[1|2] initialization parameter values and delete them. Then restart the broker by setting DG_BROKER_START to true.