Error
Error Code: ORA-29742

Oracle Error ORA-29742: Protocol Incompatibility

📦 Oracle Database
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Description

The ORA-29742 error indicates that the Instance Membership Recovery (IMR) protocol settings are inconsistent across different instances in your Oracle cluster database. This typically occurs during instance startup or when modifying IMR parameters.
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Error Message

ORA-29742: incompatible Instance Membership Recovery protocol among instances
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Known Causes

3 known causes
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Inconsistent IMR Parameters
Different instances in the cluster are configured with different values for Instance Membership Recovery initialization parameters, causing a protocol mismatch. ⚙
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Incorrect Parameter Scope
IMR parameters were modified at the wrong scope (e.g., instance level instead of system level), leading to inconsistencies. 💻
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Rolling Upgrade Issues
An incomplete or improperly executed rolling upgrade may have left some instances with older IMR protocol versions. ⚠
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Solutions

Coming Soon

Detailed 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

Find Help

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