Massive DELETEs

Postgres FM

Nikolay and Michael discuss doing massive DELETE operations in Postgres — what can go wrong, how to prevent major issues, and some ideas to minimise their impact.
Here are some links to things they mentioned:

• Article based on Nikolay’s talk, including batching implementation (translated to English) https://habr-com.translate.goog/en/articles/523536/?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hist=true
• Our episode on WAL and checkpoint tuning https://postgres.fm/episodes/wal-and-checkpoint-tuning
• Egor Rogov’s book on Postgres Internals (chapter 10 on WAL) https://edu.postgrespro.com/postgresql_internals-14_en.pdf
• full_page_writes https://www.postgresql.org/docs/current/runtime-config-wal.html#GUC-FULL-PAGE-WRITES
• TRUNCATE https://www.postgresql.org/docs/current/sql-truncate.html
• Our episode on partitioning https://postgres.fm/episodes/partitioning
• Our episode on bloat https://postgres.fm/episodes/bloat
• Our episode on index maintenance https://postgres.fm/episodes/index-maintenance

~~~

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!

~~~

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