Error
Error Code:
ORA-29736
Oracle Error ORA-29736: Read-Only Cluster
Description
The ORA-29736 error indicates that all instances currently running in the Oracle cluster are either read-mostly or read-only. This configuration is not supported and can lead to cluster shutdown, as at least one read/write instance is required for proper operation.
Error Message
ORA-29736: Instances running in the cluster are only read-mostly or read-only instances.
Known Causes
3 known causesRead-Only Instance Startup
The cluster was started with only read-mostly or read-only instances, without any read/write instances.
Accidental Shutdown
The read/write instances in the cluster were unexpectedly shut down, leaving only read-mostly or read-only instances running.
Maintenance Mode
The cluster was inadvertently left in a maintenance mode where only read-mostly or read-only instances are active.
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