First LQO Release Finds the PostgreSQL Queries a Planner Setting Makes Faster

Mon, 19 Oct 2026 00:00:00 +0000

Every PostgreSQL database has a few queries the planner gets badly wrong. Not slow because they’re big. Slow because the planner guessed the wrong row count, picked a plan for ten rows, and got ten thousand. Finding them is usually an afternoon with EXPLAIN ANALYZE, one query at a time.

LQO 0.1 does that afternoon for a whole workload. Give it a server log or a file of queries, point it at a replica, and it runs each kind of query under PostgreSQL’s default plan and under a set of planner settings. Then it tells you which settings make which queries clearly faster, with the exact lines to use.

Postgresql on lqo.net

First LQO Release Finds the PostgreSQL Queries a Planner Setting Makes Faster