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Выполнение операции switchover в Data Guard Broker’е выдает ошибку ORA-12514:

DGMGRL> switchover to exampledb02;
Performing switchover NOW, please wait...
Operation requires a connection to instance "exampledb" on database "exampledb02"
Connecting to instance "exampledb"...
Connected.
New primary database "exampledb02" is opening...
Operation requires startup of instance "exampledb" on database "exampledb"
Starting instance "exampledb"...
Unable to connect to database
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Failed.
Warning: You are no longer connected to ORACLE.

Please complete the following steps to finish switchover:
        start up instance "exampledb" of database "exampledb"

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