Here's information on how to troubleshoot some of the issues encountered when using Database Management Diagnostics & Management for Oracle Databases.

• Errors Encountered When Registering External Databases

• Errors Encountered When Enabling Diagnostics & Management for External Databases

• Errors Encountered When Enabling Diagnostics & Management for Oracle Cloud Databases

• Errors Encountered When Monitoring and Managing Oracle Databases

• Errors Encountered When Using Performance Hub

For information on general Oracle Database errors and how to resolve them, see Error Help Portal for Oracle Database.