When system mail rules or headlines are used on a Domino server, the server keeps in memory the list of databases affected so that when a note is updated, databases that must react to note updates can be found quickly and the action taken. By default, if the action involves a programatic check, such as a system mail rule, the code to perform that check is cached as well. On a server with many such monitors, the memory required to cache the code to perform the monitoring may be so big that normal server operations are affected. Use this variable to prevent caching. This greatly reduces memory usage at a small cost in processing power.
Disabled (equivalent to DONT_CACHE_MONITOR_FORMULAS=0)
Include this setting to reduce memory demands on the server. Must equal "1" and only "1" to enable.
However, If you know you've got enough memory, or that you have few rules to cache, remove this setting.
Valid on all Domino platforms, except 390.
Valid for Domino versions 7.0 and beyond.
Notes/Domino Fix List
Domino 7 Admin documentation
Domino Configuration Tuner:
This setting is included in the DCT
catalog of best practices.