If you have been running a ServiceNow instance for a few years, you have likely had that moment: a clone takes forever, an upgrade window keeps stretching, or someone from finance asks why the hosting bill climbed again. The root cause is almost always the same — unchecked or not well managed database growth, often paired with a lack of proper data lifecycle management. Unchecked database growth is the silent performance killer in ServiceNow environments. This guide provides a comprehensive framework for understanding, measuring, and managing your instance footprint across all major table categories.