Mongodb: when to call ensureIndex?

Question

When should I call ensureIndex? Before inserting a single record, after inserting a single record, or before calling find()?

Regards,

Johnny

Answer 1

If you add an index before hand, every insert/update/delete call has to modify each index also. So, from an optimization stand point, you probably want to put it off as long as possible before issuing queries. However, from a functional stand point, it doesn't matter.