Posts about PostGIS Performance

PostGIS Performance: Indexing and EXPLAIN

I am kicking off a short blog series on PostGIS performance fundamentals. For this first example, we will cover fundamental indexing. We will explore performance using the Natural Earth “admin0” (countries) data (258 polygons) and their “populated places” (7342 points). A classic spatial query is the “spatial join”, finding the relationships between objects using a spatial contain. “How many populated places are there within each country?” This returns an answer, but it takes 2200 millisecond...