If you are currently planning on upgrading to TimesTen 18.1 or 22.1, please be sure to use one of the most recent patch releases (18.1.4.30.0 or later, 22.1.1.7.0 for later). There is a known issue in older patch releases that may result in significantly increased space usage, and continued space usage growth, over time. That issue is fixed as from 18.1.4.30.0 and 22.1.1.7.0.