Error
Error Code:
239
MongoDB Error 239: Snapshot Too Old
Description
This error indicates that a read operation or transaction could not find the required historical data snapshot. It typically occurs when an operation attempts to access a consistent view of data that has already been purged from the database's internal history due to ongoing write activity.
Error Message
Snapshot Too Old
Known Causes
4 known causesLong-Running Operations
An operation attempts to read data from a point in time that has been purged because the operation itself took too long to complete.
High Write Workload
Intense write activity on the database causes older snapshots to be purged quickly, making them unavailable for concurrent reads requiring a consistent view.
WiredTiger Cache Constraints
Insufficient WiredTiger cache size or improper configuration can limit the history retention, leading to premature snapshot eviction.
Secondary Replication Lag
On a replica set, a secondary member falling significantly behind the primary may lack the necessary historical data for consistent reads.
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