kernel asynchronous reads in PostgreSQL 19 (io_uring)
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PostgreSQL 19 introduces io_uring for async reads, significant for database performance.
Summary
PostgreSQL 19's io_uring support enables kernel-managed asynchronous buffered reads, eliminating dedicated IO worker processes. In tests with a parallel sequential scan, io_uring delivered similar performance (943ms execution time) to the worker method, using io_combine_limit of 128kB and io_max_concurrency of 64. Docker containers require seccomp=unconfined to enable io_uring syscalls.