Hash indexes

Nikolay and Michael discuss hash indexes in Postgres — what they are, some brief history, their pros and cons vs btrees, and whether or when they recommend using them.

Update: the idea Nikolay mentioned at the end of this episode turns out to be a little fraught (and as such, inadvisable). 
 
Here are some links to things they mentioned:

• Index types (docs) https://www.postgresql.org/docs/current/indexes-types.html  
• Re-introducing hash indexes in PostgreSQL (blog post by Haki Benita and Michael) https://hakibenita.com/postgresql-hash-index 
• Hash indexes intro (docs) https://www.postgresql.org/docs/current/hash-intro.html 
• Hash indexes implementation (docs) https://www.postgresql.org/docs/current/hash-implementation.html

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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