I work on PostgreSQL performance and the systems around it — finding why a query costs what it costs, fixing it, and shipping the fix.https://farol.dev/https://farol.dev/blog/a-benchmark-that-understates-the-problem/https://farol.dev/blog/a-benchmark-that-understates-the-problem/A cascade delete that took seven minutes in production is a barely-visible win on my laptop. Measuring the per-statement cost showed why, and why a local number here is a floor rather than the size of the fix.Fri, 18 Sep 2026 00:00:00 GMTpostgreshttps://farol.dev/blog/an-array-parameter-of-the-wrong-width/https://farol.dev/blog/an-array-parameter-of-the-wrong-width/The same id list, one type wider than the column, costs two hundred times as much. PostgreSQL explains both statements with the identical plan, and EXPLAIN reports the same buffers.Fri, 18 Sep 2026 00:00:00 GMTpostgres