SNOW-CAD Integrating and managing application data Practice Question
Exhibit
2023-01-15 10:23:45 ERROR com.glide.mid.MIDServerException: Connection to database failed: ORA-12514: TNS listener not currently aware of service requested in connect descriptor at com.glide.mid.oracle.OracleConnection.checkConnection(OracleConnection.java:56)
Refer to the exhibit. A MID Server is failing to connect to an external Oracle database. The error log shows the above message. Which is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The database instance name (service name) is incorrect in the configuration.
Error ORA-12514 indicates that the listener received a connection request but the service name (in the connect descriptor) is not known to the listener. This usually means the database service name is incorrect or the listener is not configured for that service.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The firewall is blocking port 1521.
Why it's wrong here
A firewall block would result in a timeout or connection refused, not ORA-12514.
- ✗
The Oracle client is not installed.
Why it's wrong here
If the Oracle client were missing, there would be a different error about missing driver or classes.
- ✗
The MID Server is not running.
Why it's wrong here
The MID Server is running, as it is able to attempt the connection and produce the error.
- ✓
The database instance name (service name) is incorrect in the configuration.
Why this is correct
Correct: The error indicates the listener does not recognize the service requested.
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