> 10,000,000 document index > Internal Document id is 32 bit unsigned int > Max Memory Used by a single cache slot in the filter cache = 32 bits x > 10,000,000 docs = 320,000,000 bits or 38 MB
I think it depends on where exactly the result set was generated. I believe the result set will usually be represented by a BitDocSet, which requires 1 bit per doc in your index (result set size doesn't matter), so in your case it would be about 1.2MB. -Michael
