Error
Error Code: ORA-29705

Oracle ORA-29705: Instance Count Mismatch

📦 Oracle Database
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Description

This error indicates a discrepancy in the `ACTIVE_INSTANCE_COUNT` parameter across different instances within an Oracle cluster database. It occurs during instance startup or configuration changes when this critical parameter is inconsistent.
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Error Message

ORA-29705: ACTIVE_INSTANCE_COUNT is string which is incompatible with the value in other instances
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Known Causes

3 known causes
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Parameter File Mismatch
The `ACTIVE_INSTANCE_COUNT` parameter is set differently in the initialization parameter files (e.g., spfile.ora, init.ora) of different instances. ⚠
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Manual Configuration Error
A user has manually modified the `ACTIVE_INSTANCE_COUNT` parameter in one or more instances without synchronizing the changes across the cluster. ⚠
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Scripting Error
An automated script or process incorrectly configured the `ACTIVE_INSTANCE_COUNT` parameter on specific instances, leading to inconsistencies. 💻
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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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