The VACUUM Deep Dive: Asynchronous I/O and Beyond in PostgreSQL 18
24 November
Intermediate
PostgreSQL 18 ships the biggest set of VACUUM and autovacuum improvements in years. Beyond the headline asynchronous I/O (AIO) subsystem, this release adds smarter triggering rules, more flexible worker management, explicit control over tail truncation, better freezing behavior, and much richer observability for maintenance operations.