big data with >150mil document

I have a collection with >150mil documents, in the future, i can reach 500mil or more, but now, when I query that collection with some condition, it really run very slow (I was indexed it). How can I turning query, can I partition that collection?, I only have one server. Please tell me your experience




Can you provide us with more information?

• MongoDB version
• Driver and its version
• Example of a query that runs too slowly
• an explain for the slow-running query