Error
Error Code: ORA-29739

Oracle Error ORA-29739: Incompatible Instance Modes

📦 Oracle Database
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Description

The ORA-29739 error occurs in Oracle Database when you attempt to start instances with incompatible read modes (Read-mostly and Read-only) within the same cluster. This configuration is not supported and prevents the database from starting correctly.
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Error Message

ORA-29739: Read-mostly and Read-only instances cannot be part of same cluster
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Known Causes

2 known causes
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Mixed Instance Modes
The cluster contains instances configured with both Read-mostly and Read-only modes, which are mutually exclusive.
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Incorrect Configuration
The instance mode was incorrectly configured during instance startup or parameter file modification.
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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

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