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Upgrade to Oracle Database 12c Exam Questions

Oracle

Upgrade to Oracle Database 12c

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Question 16:

The tnsnames.ora file has an entry for the service alias ORCL as follows: 
image
The TNSPING command executes successfully when tested with ORCL; however, from the same OS user session, you are not able to connect to the database instance with the following command: SQL > CONNECT scott/tiger@orcl - What could be the reason for this? 

Answer options:

A. The listener is not running on the database node.
B. The TNS_ADMIN environment variable is set to the wrong value.
C. The orcl.oracle.com database service is not registered with the listener.
D. The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.
E. The listener is running on a different port.