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 ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/) that was published on June 30, 2025. 

# Query troubleshooting
<a name="queries-troubleshooting"></a>

This section provides a quick reference for identifying and addressing some of the most common and most serious issues that you are likely to encounter with Amazon Redshift queries.

**Topics**
+ [Connection fails](queries-troubleshooting-connection-fails.md)
+ [Query hangs](queries-troubleshooting-query-hangs.md)
+ [Query takes too long](queries-troubleshooting-query-takes-too-long.md)
+ [Load fails](queries-troubleshooting-load-fails.md)
+ [Load takes too long](queries-troubleshooting-load-takes-too-long.md)
+ [Load data is incorrect](queries-troubleshooting-load-data-incorrect.md)
+ [Setting the JDBC fetch size parameter](set-the-JDBC-fetch-size-parameter.md)

These suggestions give you a starting point for troubleshooting. You can also refer to the following resources for more detailed information.

For information about behavior changes in Amazon Redshift functionality that may affect your application, see [Behavior Changes](https://docs.aws.amazon.com/redshift/latest/mgmt/behavior-changes.html).
+ [Accessing Amazon Redshift clusters and databases](https://docs.aws.amazon.com/redshift/latest/mgmt/using-rs-tools.html)
+ [Automatic table optimization](t_Creating_tables.md)
+ [Loading data in Amazon Redshift](t_Loading_data.md)
+ [Tutorial: Loading data from Amazon S3](tutorial-loading-data.md)