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The real cost of random I/O

vondra.me · published 26 February 2026

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https://www.postgresql.org/message-id/flat/14601.949786166@sss.pgh.pa.us
postgresql.org
https://github.com/postgres/postgres/blob/4c1a27e53a508f74883cda52a6c8612121d7fd6b/src/backend/optimizer/path/costsize.c
github.com
https://github.com/postgres/postgres/blob/master/src/backend/optimizer/path/costsize.c
github.com
https://vondra.me/posts/estimated-random-page-cost.png
vondra.me
https://vondra.me/posts/cost-duration-scans.png
vondra.me
https://vondra.me/posts/cost-duration-zoom.png
vondra.me
https://vondra.me/posts/cost-duration-fixed.png
vondra.me
https://vondra.me/posts/cost-duration-with-bitmapscan.png
vondra.me
https://www.postgresql.org/message-id/20090112051045.3F755754877%40cvs.postgresql.org
postgresql.org
Tuning AIO in PostgreSQL 18 Read at the source ↗
vondra.me
https://vondra.me/posts/estimated-random-page-cost-no-prefetch.png
vondra.me
https://www.postgresql.org/message-id/5qum3e5rzblbuw4m5cb7g6l5d6y2gip4ltz6pouutqkljc645r%40ibvg5dygvqgl
postgresql.org
https://learn.microsoft.com/en-us/shows/posette-an-event-for-postgres-2024/where-do-the-performance-cliffs-come-from
learn.microsoft.com
https://postgres.fm/episodes/performance-cliffs
postgres.fm
https://www.postgresql.org/message-id/80d8b470-50fe-40df-b692-3292dd015595%40vondra.me
postgresql.org
https://www.postgresql.org/message-id/wc7mgalaplotpetwcackcbrm4lwdkvyajdcsi2gsslhknfavzi%40t5jo47nnyppa
postgresql.org
https://www.postgresql.org/message-id/CA%2BTgmoagjyStEVKymvA_kxLfKXhHUj5beaBZ_JVU9mOxrX%2Bm2g%40mail.gmail.com
postgresql.org
https://www.postgresql.org/message-id/6ysaf44vvhgujw4tsl25vwshifizsuzfvcxlsdjrsqogmg2wzt%40wehmt3xd6ayj
postgresql.org