Materialized view refresh failure notification

To set up failure notifications for materialized view refreshes in Amazon Redshift, you'll need to implement a custom monitoring solution as there isn't a built-in feature specifically for this purpose. Here's an approach you can consider:

1. Create a scheduled task (e.g., using AWS Lambda) that runs daily to check the status of your materialized view refreshes.

2. In this task, query the Redshift system tables to check the status of materialized view refreshes. You can use the SVL_MV_REFRESH_STATUS table to get information about the most recent refresh attempts for each materialized view.

3. If a refresh failure is detected, use Amazon Simple Notification Service (SNS) to send an email notification.

4. To get more detailed error information, you may need to check additional system tables or logs, as the specific error message might not be readily available in the SVL_MV_REFRESH_STATUS table.

5. Consider implementing logging in your refresh process. For example, if you're using the REFRESH MATERIALIZED VIEW statement in a stored procedure or SQL script, add error handling and logging to capture any issues that occur during the refresh.

6. For a more comprehensive solution, you could use AWS CloudWatch to monitor your Redshift cluster and set up alarms based on specific metrics or log patterns that indicate materialized view refresh failures.

7. If you're using automated refreshes, keep in mind that Amazon Redshift may delay some refreshes based on system load and available resources. This behavior is by design to preserve performance for user workloads, so not all delayed refreshes should be treated as failures.

By implementing this kind of custom monitoring and notification system, you'll be able to receive timely alerts when your materialized view refreshes fail, allowing you to investigate and resolve issues promptly.
Sources
Refreshing materialized views - AWS Prescriptive Guidance
Refreshing a materialized view - Amazon Redshift
REFRESH MATERIALIZED VIEW - Amazon Redshift