`hot_standby_feedback` trades primary bloat to prevent query cancellations on standbys—but it only stops cleanup conflicts, not lock or drop conflicts, and…

PostgreSQL's hot_standby switch transforms a spare server into a readable replica, but the real tuning work happens elsewhere.

hba_file points to your authentication rules, not the rules themselves. Reload changes to pg_hba.conf instantly; restart when moving the file.

Hash and sort operations have wildly different relationships with memory, and `hash_mem_multiplier` lets you feed them separately.

PostgreSQL 16 lets servers accept delegated Kerberos credentials to act as users against other services, but it defaults to off because the trade-off is real…

PostgreSQL's `gin_fuzzy_search_limit` silently returns a random subset of matching rows instead of all results—a dangerous trade of correctness for speed that…

PostgreSQL's genetic query optimizer has seven knobs, but you should probably only touch one. Learn which one, and why the others are best left alone.

Why PostgreSQL logs entire pages after crashes and why turning it off is riskier than it sounds.

fsync defaults to on and is the most dangerous setting in postgresql.conf—set it wrong and you risk unrecoverable data corruption, not just bad plans.

Subqueries in FROM clauses get flattened into the outer query by default—but only if the resulting join problem stays small enough.