Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, 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/). 

# Query analysis and improvement
<a name="c-query-tuning"></a>

Retrieving information from an Amazon Redshift data warehouse involves running complex queries on extremely large amounts of data, which can take a long time to process. To make sure that queries process as quickly as possible, there are a number of tools you can use to identify potential performance issues.

**Topics**
+ [Query analysis workflow](c-query-analysis-process.md)
+ [Reviewing query alerts](c-reviewing-query-alerts.md)
+ [Analyzing the query plan](c-analyzing-the-query-plan.md)
+ [Analyzing the query summary](c-analyzing-the-query-summary.md)
+ [Query performance improvement](query-performance-improvement-opportunities.md)
+ [Diagnostic queries for query tuning](diagnostic-queries-for-query-tuning.md)