The cluster that ran all weekend: finding idle compute in your Databricks bill

All-purpose clusters are built for people working interactively. When a scheduled job runs on one, or someone forgets to turn one off, you pay interactive rates for idle time.

Find them in the system tables

Join the cluster and billing system tables to see which all-purpose clusters ran with nobody attached, and what each one cost.

Fix it

Move scheduled work to job compute, and set auto-termination in a cluster policy so idle clusters shut themselves down.