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EPISODE · Jun 11, 2026 · 9 MIN

Why Database Partition Pruning Fails Without Careful Design

from Database Tech with Fexingo: SQL, NoSQL, and Data Storage Conversations · host Fexingo

Episode 44 of Database Tech with Fexingo: Lucas and Luna dig into a subtle performance killer in partitioned databases — partition pruning that silently doesn't prune. They walk through how a real-world e-commerce system ran full-table scans on 200 partitions because the WHERE clause used a function-wrapped partition key. They explain how databases like PostgreSQL and MySQL handle partition elimination, why DATE() on a timestamp column defeats it, and the one index trick that can backfire. Listeners learn how to audit their own queries for accidental full scans, and why a seemingly clean schema can hide a 100x performance gap. This episode is for engineers who think their partitioned tables are fast — but haven't checked the query plan lately. #DatabasePartitioning #PartitionPruning #SQLPerformance #QueryOptimization #PostgreSQL #MySQL #DatabaseDesign #TechPodcast #DatabaseTechWithFexingo #DataEngineering #PerformanceTuning #Indexing #DatabaseInternals #FexingoBusiness #BusinessPodcast #Technology #SoftwareEngineering #BackendDev Keep every episode free: buymeacoffee.com/fexingo

Episode metadata supplied by the publisher feed · Published Jun 11, 2026

What this episode covers

Episode 44 of Database Tech with Fexingo: Lucas and Luna dig into a subtle performance killer in partitioned databases — partition pruning that silently doesn't prune. They walk through how a real-world e-commerce system ran full-table scans on 200 partitions because the WHERE clause used a function-wrapped partition key. They explain how databases like PostgreSQL and MySQL handle partition elimination, why DATE() on a timestamp column defeats it, and the one index trick that can backfire. Listeners learn how to audit their own queries for accidental full scans, and why a seemingly clean schema can hide a 100x performance gap. This episode is for engineers who think their partitioned tables are fast — but haven't checked the query plan lately. #DatabasePartitioning #PartitionPruning #SQLPerformance #QueryOptimization #PostgreSQL #MySQL #DatabaseDesign #TechPodcast #DatabaseTechWithFexingo #DataEngineering #PerformanceTuning #Indexing #DatabaseInternals #FexingoBusiness #BusinessPodcast #Technology #SoftwareEngineering #BackendDev Keep every episode free: buymeacoffee.com/fexingo

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How long is this episode of Database Tech with Fexingo: SQL, NoSQL, and Data Storage Conversations?

This episode is 9 minutes long.

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This episode was published on June 11, 2026.

What is this episode about?

Episode 44 of Database Tech with Fexingo: Lucas and Luna dig into a subtle performance killer in partitioned databases — partition pruning that silently doesn't prune. They walk through how a real-world e-commerce system ran full-table scans on 200...

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