Error
Error Code:
ORA-28502
Oracle ORA-28502: Heterogeneous Link Failure
Description
The ORA-28502 error indicates a communication breakdown within Oracle's Heterogeneous Services. This typically occurs when attempting to access data from a non-Oracle database via a database link and the connection between Oracle and the foreign database fails.
Error Message
ORA-28502: internal communication error on heterogeneous database link
Known Causes
4 known causesNetwork Connectivity Issue
A firewall, network outage, or incorrect network configuration is preventing communication between the Oracle database server and the remote database server. 🌐
Incorrect Database Link Definition
The database link definition contains incorrect connection parameters (e.g., username, password, or connection string) preventing a successful connection to the foreign database. 🔒
Heterogeneous Services Configuration Error
The Heterogeneous Services (HS) agent is not properly configured to communicate with the specific foreign database, leading to communication failures. ⚙
Foreign Database Unavailable
The remote database server is down, unreachable, or experiencing performance issues, preventing Oracle from establishing a connection. 💻
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service