Nik and Michael discuss multi-column indexes in Postgres — what they are, how to think about them, and some guidance around using them effectively.
 
Here are some links to things they mentioned:

• Multicolumn Indexes (docs) https://www.postgresql.org/docs/current/indexes-multicolumn.html
• Our episode on Index-only scans https://postgres.fm/episodes/index-only-scans
• Combining Multiple Indexes (docs) https://www.postgresql.org/docs/current/indexes-bitmap-scans.html
• Enable BUFFERS with EXPLAIN ANALYZE by default https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=c2a4078ebad71999dd451ae7d4358be3c9290b07
• “PostgreSQL includes an implementation of the standard btree […] The only limitation is that an index entry cannot exceed approximately one-third of a page” https://www.postgresql.org/docs/current/btree.html
• Our episode on HOT updates https://postgres.fm/episodes/hot-updates
• Our episode on LIMIT vs Performance https://postgres.fm/episodes/limit-vs-performance

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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 credit to:

• Jessie Draws for the elephant artwork