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EPISODE · May 27, 2026 · 9 MIN

Why Database Indexes Become Worse Than Useless

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

Lucas and Luna dive into the surprisingly common problem of database index bloat — when indexes intended to speed up queries actually slow them down. They explore a real-world case from a mid-sized e-commerce company whose poorly managed indexes caused query times to spike from 50 milliseconds to over 8 seconds during Black Friday traffic. Along the way, they unpack how B-tree fragmentation, unused indexes, and non-selective keys waste RAM and disk I/O, and why dropping indexes can be the best performance optimization. The episode also touches on diagnostic tools like pg_stat_user_indexes and the tradeoff between index maintenance costs and read performance. A quick donation segment reminds listeners that listener support via Buy Me a Coffee keeps the show ad-free. #DatabaseIndexBloat #IndexFragmentation #BTreeIndex #QueryPerformance #DatabaseOptimization #PostgreSQL #MySQL #IndexMaintenance #BlackFridayCrash #ReadVsWriteOptimization #pg_stat_user_indexes #UnusedIndexes #DatabaseAdministration #Technology #SQL #DataStorage #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo

Episode metadata supplied by the publisher feed · Published May 27, 2026

What this episode covers

Lucas and Luna dive into the surprisingly common problem of database index bloat — when indexes intended to speed up queries actually slow them down. They explore a real-world case from a mid-sized e-commerce company whose poorly managed indexes caused query times to spike from 50 milliseconds to over 8 seconds during Black Friday traffic. Along the way, they unpack how B-tree fragmentation, unused indexes, and non-selective keys waste RAM and disk I/O, and why dropping indexes can be the best performance optimization. The episode also touches on diagnostic tools like pg_stat_user_indexes and the tradeoff between index maintenance costs and read performance. A quick donation segment reminds listeners that listener support via Buy Me a Coffee keeps the show ad-free. #DatabaseIndexBloat #IndexFragmentation #BTreeIndex #QueryPerformance #DatabaseOptimization #PostgreSQL #MySQL #IndexMaintenance #BlackFridayCrash #ReadVsWriteOptimization #pg_stat_user_indexes #UnusedIndexes #DatabaseAdministration #Technology #SQL #DataStorage #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo

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Frequently Asked Questions

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

This episode is 9 minutes long.

When was this Database Tech with Fexingo: SQL, NoSQL, and Data Storage Conversations episode published?

This episode was published on May 27, 2026.

What is this episode about?

Lucas and Luna dive into the surprisingly common problem of database index bloat — when indexes intended to speed up queries actually slow them down. They explore a real-world case from a mid-sized e-commerce company whose poorly managed indexes...

Can I download this Database Tech with Fexingo: SQL, NoSQL, and Data Storage Conversations episode?

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