Episode 109
Index-Only Scans
Postgres FM · Nikolay Samokhvalov and Michael Christofides
August 9, 202439m 15s
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Show Notes
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) https://www.postgresql.org/docs/current/indexes-index-only-scans.html
- Discussion on Twitter about JIT and Parallel Query defaults https://x.com/jer_s/status/1819749688184373742
- Postgres Wiki on Index-Only Scans https://wiki.postgresql.org/wiki/Index-only_scans
- Heap Fetches https://www.pgmustard.com/docs/explain/heap-fetches
- Rows Removed By Filter https://www.pgmustard.com/docs/explain/rows-removed-by-filter
- random_page_cost https://postgresqlco.nf/doc/en/param/random_page_cost/
- pg_dump docs change https://x.com/samokhvalov/status/1820539826363588755
- Crunchy Bridge changed random_page_cost to 1.1 for new servers https://docs.crunchybridge.com/changelog#postgres_random_page_cost_1_1
- Autovacuum Tuning Basics (updated blog post by Tomas Vondra) https://www.enterprisedb.com/blog/autovacuum-tuning-basics
- Our episode on over-indexing https://postgres.fm/episodes/over-indexing
- Our episode on HOT updates https://postgres.fm/episodes/hot-updates
- Our episode on partitioning https://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, or by commenting on our Google doc!
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Postgres FM is produced by:
- Michael Christofides, founder of pgMustard
- Nikolay Samokhvalov, founder of Postgres.ai
With special thanks to:
- Jessie Draws for the elephant artwork
Topics
PostgresPostgreSQLDatabasesSQLtechnology