Tuning PostgreSQL Autovacuum for High-Churn SaaS Tables to Curb Bloat

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A technical guide explains how PostgreSQL's MVCC model leaves dead tuples on disk after updates and deletes until VACUUM reclaims them. It describes how the default cost-based autovacuum throttle, governed by parameters like vacuum_cost_limit and vacuum_cost_delay, can slow cleanup on busy tables. The author notes that high-churn tables may take hours to vacuum, during which new dead tuples accumulate. A monitoring query against pg_stat_user_tables is suggested to identify tables with high dead-tuple ratios. The guide also recommends per-table storage parameter overrides via ALTER TABLE to let frequently churned tables vacuum more aggressively without affecting the rest of the cluster.

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