Error 'ora-12560: tns:protocol adapter error'. what does it mean?

This error indicates an issue with the way the client is trying to connect to the database.

Example:


ORA-12560: TNS:protocol adapter error

Solution:


1. Ensure Oracle services are up and running.
2. Check your connection string and ensure it's correct.
3. Make sure you're using the correct Oracle client version.

Beginner's Guide to SQL