Slow MongoDB query: can you explain why?

Question

I have a MongoDB query that\'s taking an unreasonably long time to run, but it:

• is only scanning 6 objects
• hits an index
• consistently takes ~

Answer 1

Missing the index on the private key?

BtreeCursor owner_1_avatar_1_date_-1 vs .find({ owner: "123", avatar: false, private: false }).sort({date: -1})