The CDC Error Alert is triggered by default when SQL Server detects a problem in the CDC mechanism, such as:
- The capture job is failing.
- Change tables are inaccessible.
- Log reading issues.
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Detecting these errors promptly is critical because if CDC stops working, data changes will not be captured, leading to incomplete or inconsistent downstream data.
What can be done:
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Check CDC jobs: Ensure the capture and cleanup SQL Agent jobs are running.
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Inspect logs: Review the SQL Server logs and CDC tables for error details.
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Restart CDC: Sometimes, stopping and restarting CDC on the affected table or database resolves transient issues.
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Investigate underlying issues: Disk space, permission problems, or transaction log issues may need attention.
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Alert monitoring: Keep alerts active to catch recurring problems early.
In short, CDC ensures reliable change tracking. Errors interrupt this flow, so detecting and resolving them quickly keeps your data accurate and downstream processes functioning.
About CDC
The Change Data Capture (CDC) in SQL Server is a feature that tracks changes (inserts, updates, deletes) in your tables and records them in separate change tables. It’s widely used for auditing, ETL processes, replication, and maintaining data warehouses. CDC allows you to capture data changes without modifying the application logic.
CDC ensures that any downstream systems (analytics, reporting, or replication) have accurate and up-to-date data. It reduces the risk of missing changes that could affect business decisions.
