Reads causing writes

Nikolay and Michael discuss a couple of surprising ways read queries (selects) can cause writes (shared buffers dirtied) in Postgres.

Here are some links to things they mentioned:
• Reads causing writes in Postgres (post by Alex Jesipow) jesipow.com/blog/postgres-reads-cause-writes
• Exploring how SELECT queries can produce disk writes (post by Nikolay Sivko) blog.okmeter.io/postgresql-exploring-how-selec…
• Hint Bits (wiki) wiki.postgresql.org/wiki/Hint_Bits
• pg_stat_statements postgresql.org/docs/current/pgstatstatements.h…
• pg_stat_kcache github.com/powa-team/pg_stat_kcache
• pg_wait_sampling github.com/postgrespro/pg_wait_sampling
• BUFFERS by default (episode 4!) postgres.fm/episodes/buffers-by-default
• Page layout (docs) postgresql.org/docs/current/storage-page-layou…
• From Reddit (user merlinm), PD_ALL_VISIBLE may be a third case reddit.com/r/PostgreSQL/comments/1hjuyfn/comme…
• Coroot coroot.com

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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