PostgreSQL Labs on Database DevPro https://DatabaseDevPro.com/labs/postgresql/ Recent content in PostgreSQL Labs on Database DevPro Hugo -- gohugo.io en jeff.taakey@gmail.com (Jeff Taakey) jeff.taakey@gmail.com (Jeff Taakey) © 2026 Jeff Taakey Sat, 07 Feb 2026 00:00:00 +0000 PostgreSQL Index vs Full Scan: EXPLAIN ANALYZE on 100k / 1M / 5M Rows (Filter + ORDER BY + LIMIT) https://DatabaseDevPro.com/labs/postgresql/index-vs-full-scan/ Sat, 07 Feb 2026 00:00:00 +0000 jeff.taakey@gmail.com (Jeff Taakey) https://DatabaseDevPro.com/labs/postgresql/index-vs-full-scan/ A reproducible lab showing how a composite index changes the execution plan from (parallel) seq scan + sort to index scan + limit, with EXPLAIN (ANALYZE, BUFFERS) evidence on 100k/1M/5M rows.