Query hints

Postgres FM

Nikolay and Michael discuss query hints — what they are, what we do and don't have in PostgreSQL, and some other things in and around the ecosystem to be aware of.
Here are some links to some extra things they mentioned:

• Query planning (docs) https://www.postgresql.org/docs/current/runtime-config-query.html
• Statistics used by the planner (docs) https://www.postgresql.org/docs/current/planner-stats.html
• default_statistics_target https://www.postgresql.org/docs/current/runtime-config-query.html#GUC-DEFAULT-STATISTICS-TARGET
• Optimiser hints discussion (wiki) https://wiki.postgresql.org/wiki/OptimizerHintsDiscussion
• An example mailing list thread from 2006 https://www.postgresql.org/message-id/flat/20061012151439.GT28647%40nasby.net
• Peter Geoghegan tweet regarding invalid index https://twitter.com/petervgeoghegan/status/1599191964045672449
• plantuner http://sigaev.ru/git/gitweb.cgi?p=plantuner.git;a=blob;hb=HEAD;f=README.plantuner
• pg_hint_plan https://github.com/ossc-db/pg_hint_plan
• Aurora PostgreSQL query plan management https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.Optimize.overview.html
• Building automatic adviser & performance tuning tools - Julien Rouhaud & Tatsuro Yamada: PGCon 2020 (the completely misremembered presentation Michael mentioned 🙈) https://www.youtube.com/watch?v=LQZK6p3SwwA
• hypopg https://github.com/HypoPG/hypopg

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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 brought to you by:

• Nikolay Samokhvalov, founder of Postgres.ai
• Michael Christofides, founder of pgMustard

With special thanks to:

• Jessie Draws for the amazing artwork