M312 course Slow Queries - Response Time Degradation (Part 1)

Hello, I have a question about Mongo University course (course name in the title), there is mentioning about degradation caused by innapropriate setting dbCacheSize (too small). As an example there is restore database and from mongostat values dirty and used memory are not similar. Could you explain me more precisely why? If we have mongorestre so there’ll be a lot of inserts so why it requires enough memory for working set? And in that case what working set consist? Collections which are writed on (if this is parallel process more than one collection is writed on)? I thought if we do inserts we don’t need load collection into memory so there will be only that insert (dirty one page).

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