node.js - MongoDB Scalable setup -

hello every setup this.

1. mongodb replica sets 3 members.
2. enable indexing
3. enable oplog on node.js app

i ask other tips/guides how optimize mongodb. way add members in replica set? or add sharding?

replication durability , availability, not scaling. if need scale use sharding. before setting sharded cluster several important decision should made based on how application operates (data model, requests etc.), further reference see documentation.