IBM says that the ratio of Database.DbCache.Hit to Database.DbCache.Lookups on a Domino server is a performance indicator. If the ratio of Database.DbCache.Hit to "Database.DbCache.Lookups" is high, then the database cache is being effectively managed.
If the ratio is low, then the server is in need of additional physical memory. My question is what is a low ratio? Looking at ten of my servers, I see a range in percentages from .11 to .71. Should I be concerned when the ratio is 1 to 2, or is the cutoff point higher or lower than that? Six of the ten servers have a DBcache hit rate of 50% or less.