In this episode of Scaling Postgres, we discuss an incremental sort instability issue with the Postgres planner, whether we should use foreign keys, how the visibility map works and how to vacuum the template0 database. To get the show notes as well as get notified of new episodes, visit:  https://www.scalingpostgres.com/episodes/322-postgres-sort-instability/ Want to learn more about Postgres performance? Join my FREE training called Postgres Performance Demystified here: https://www.scalingpostgres.com/courses/postgres-performance-demystified/