Final answer:
Ora-12504 is an error code in Oracle Database that indicates an issue with establishing a connection. It commonly occurs when there are too many active sessions or the listener is not configured properly. To resolve the error, you can try increasing the 'PROCESSES' parameter or checking the listener configuration.
Step-by-step explanation:
Ora-12504 Error Code
Ora-12504 is an error code in Oracle Database that indicates an issue with establishing a connection. Specifically, it means that the database listener is not able to handle any more connection requests at that time. This error commonly occurs when there are too many active sessions or the listener is not configured properly.
To resolve this error, you can try increasing the 'PROCESSES' parameter in the 'init.ora' file or use the 'ALTER SYSTEM' command to increase the 'sessions' or 'processes' limit. Additionally, you can also check the listener configuration and make sure it is properly set up to handle the expected number of connections.
Learn more about Ora-12504 Error Code