I have registered the static entry with listener.
AEMF> switchover to "DRTEST";
Performing switchover NOW, please wait...
New primary database "DRTEST" is opening...
Operation requires shutdown of instance "TEST1" on database "TEST"
Shutting down instance "TEST1"...
ORACLE instance shut down.
Operation requires startup of instance "TEST1" on database "TEST"
Starting instance "TEST1"...
Unable to connect to database
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Warning: You are no longer connected to ORACLE.
Please complete the following steps to finish switchover:
start up and mount instance "TEST1" of database "TEST"