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Artwork for The Backend Engineering Show with Hussein Nasser
The Backend Engineering Show with Hussein Nasser · Oct 3, 2025 · 41 min

Postgres 18 gets Async IO

Postgres 18 has been released with many exciting features such as UUIDv7, Over explain module, composite index skip scans, and the most anticipated asynchronous IO with worker and io_uring mode which I uncover in this show. Hope you enjoy it 0:00 Intro 1:30 Synchronous vs Asynchronous calls 3:00 Synchronous IO 6:30 Asynchronous IO 10:00 Postgres 17 synchronous io 17:20 The challenge of Async IO in Postgres 18 20:00 io_method worker23:00 io_method io_uring 29:30 io_method sync 31:08 Async IO isn’t done! 3 1:30 Support for backend writers 32:36 Improve worker io_method 33:00 direct io support 37:00 Summary

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Postgres 18 has been released with many exciting features such as UUIDv7, Over explain module, composite index skip scans, and the most anticipated asynchronous IO with worker and io_uring mode which I uncover in this show. Hope you enjoy it



0:00 Intro

1:30 Synchronous vs Asynchronous calls

3:00 Synchronous IO

6:30 Asynchronous IO

10:00 Postgres 17 synchronous io

17:20 The challenge of Async IO in Postgres 18

20:00 io_method worker23:00

io_method io_uring

29:30 io_method sync

31:08 Async IO isn’t done! 3

1:30 Support for backend writers

32:36 Improve worker io_method

33:00 direct io support

37:00 Summary

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