Step 1: Login to dgmgrl and disable configuration before upgradation

DGMGRL> disable configuration;

Step 2: set dg_broker_start parameter to a false value.

SQL> alter system set dg_broker_start=false;

System altered.

Step 3: upgrade database using dbua

Step 4: Start dg_broker by setting dg_broker_start to the true value.

SQL> alter system set dg_broker_start=true;

System altered.

Step 5: connect to dgmgrl


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