Index-Only Scans

Nikolay and Michael discuss Index-Only Scans in Postgres — what they are, how they help, some things to look out for, and some advice.

Here are some links to things they mentioned:
• Index-Only Scans and Covering Indexes (docs) postgresql.org/docs/current/indexes-index-only…
• Discussion on Twitter about JIT and Parallel Query defaults x.com/jer_s/status/1819749688184373742
• Postgres Wiki on Index-Only Scans wiki.postgresql.org/wiki/Index-only_scans
• Heap Fetches pgmustard.com/docs/explain/heap-fetches
• Rows Removed By Filter pgmustard.com/docs/explain/rows-removed-by-fil…
• random_page_cost postgresqlco.nf/doc/en/param/random_page_cost
• pg_dump docs change x.com/samokhvalov/status/1820539826363588755
• Crunchy Bridge changed random_page_cost to 1.1 for new servers docs.crunchybridge.com/changelog#postgres_rand…
• Autovacuum Tuning Basics (updated blog post by Tomas Vondra) enterprisedb.com/blog/autovacuum-tuning-basics
• Our episode on over-indexing postgres.fm/episodes/over-indexing
• Our episode on HOT updates postgres.fm/episodes/hot-updates
• Our episode on partitioning postgres.fm/episodes/partitioning

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What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, (postgres.fm/people) or by commenting on our Google doc (docs.google.com/document/d/1PNGSn_d0A7gTR4C0p6…)!

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Postgres FM is produced by:
• Michael Christofides, founder of pgMustard (pgmustard.com)
• Nikolay Samokhvalov, founder of Postgres.ai (postgres.ai)

With special thanks to:
• Jessie Draws for the elephant artwork