Error
Error Code:
326
MongoDB Error 326: Oplog Sync Timestamp Missing
Description
This error indicates that a secondary replica set member cannot find the required minimum timestamp (Min Ts) in the oplog to synchronize its data with the primary. It typically occurs when a secondary attempts to catch up after being offline or lagging significantly, and the oplog has truncated past its last known synchronization point.
Error Message
Oplog Query Min Ts Missing
Known Causes
4 known causesInsufficient Oplog Size
The configured oplog size is too small, leading to rapid truncation and removal of older entries needed by a lagging secondary.
Secondary Offline Too Long
A secondary member was offline for an extended period, causing its required synchronization point to be purged from the primary's oplog.
High Replication Lag
Excessive replication lag on a secondary means it falls too far behind, and the oplog entries it needs for syncing are no longer available.
Primary Oplog Truncation
The primary's oplog has advanced and truncated past the point where the secondary expects to start its synchronization.
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