Schedule around maintenance windows - Amazon Redshift
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Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, see the blog post that was published on June 30, 2025.

Schedule around maintenance windows

If a scheduled maintenance occurs while a query is running, the query is terminated and rolled back and you need to restart it. Schedule long-running operations, such as large data loads or VACUUM operation, to avoid maintenance windows. You can also minimize the risk, and make restarts easier when they are needed, by performing data loads in smaller increments and managing the size of your VACUUM operations. For more information, see Load data in sequential blocks and Vacuuming tables.