I'm syncing from an RDS MySQL database using CDC. For one stream, there were no new events extracted (based on the

_airbyte_extracted_at

column), although there were new events in the binlog (based on the

_ab_cdc_updated_at

column). What could be the reason for this?

The issue you're experiencing where no new events are extracted for a stream, despite new events being present in the binlog, could be due to several reasons. Here are some potential causes and steps to troubleshoot: 1. Binlog Positioning: - Ensure that Airbyte is reading from the correct binlog position. Airbyte keeps track of the current log position between syncs. If the position is incorrect, it might miss new events. - Verify that the binlog position is updating correctly in the database and that Airbyte is reading from this position. This was mentioned in the forum post where the user confirmed the binlog position was updating but still faced issues with new records not being picked up ([source](https://discuss.airbyte.io/t/3329)). 2. Sync Frequency: - Ensure that your sync schedule is frequent enough to consume the logs generated. If the syncs are not frequent enough, the logs might be purged before Airbyte can read them. This is highlighted in the documentation on CDC syncing ([source](https://docs.airbyte.com/understanding-airbyte/cdc#syncing)). 3. Log Purging: - Check if the binlog files are being purged before Airbyte can read them. Binlog files are typically purged after a certain period (e.g., 10 days). If the logs are purged, Airbyte won't be able to read the new events. This was mentioned in a forum post where a user suggested that binlog files might have been deleted ([source](https://discuss.airbyte.io/t/3318)). 4. Connector Version: - Ensure that you are using the latest version of the MySQL source connector. Sometimes, updating the connector can resolve bugs related to CDC. This was suggested in a forum post where updating connectors was recommended as a troubleshooting step ([source](https://discuss.airbyte.io/t/3752)). 5. Configuration Issues: - Double-check the configuration of your Airbyte setup, especially the CDC settings. Ensure that the stream in question is correctly configured for incremental sync using CDC. By following these steps, you should be able to identify and resolve the issue with your CDC sync from the RDS MySQL database. If the problem persists, consider providing detailed logs and configuration settings to the Airbyte community or support team for further assistance.