The CDC Cleanup Delay Alert is triggered by default after a delay of 60 minutes when SQL Server detects that the CDC cleanup process is not keeping up with the expected schedule. This may indicate:
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The cleanup job is taking longer than expected.
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There is a high volume of changes that causes backlog in CDC change tables.
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Resource constraints affecting SQL Server job execution.
Detecting these delays promptly is important because if CDC cleanup lags, change tables can grow excessively, impacting database performance and potentially causing storage issues.
What can be done:
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Check CDC cleanup jobs: Ensure the SQL Agent cleanup job is running and has not been paused or blocked.
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Monitor change table size: Review the size and row count of CDC change tables to identify backlog.
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Investigate job performance: High load or long-running transactions may delay cleanup and need optimization.
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Adjust cleanup schedule: If needed, modify the frequency or resources allocated to the cleanup job.
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Alert monitoring: Keep alerts active to catch recurring delays before they impact database performance.
In short, CDC ensures reliable change tracking. Cleanup delays can affect performance and storage, so detecting and resolving them quickly helps maintain both data integrity and system stability.
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.
