MongoDB querying performance for over 5 million records

Question

We\'ve recently hit the >2 Million records for one of our main collections and now we started to suffer for major performance issues on that collection.

They documen

Answer 1

Mongo only uses 1 index per query. So if you want to filter on 2 fields, mongo will use the index with one of the fields, but still needs to scan the entire subset.

This means that basically you'll need an index for every type of query in order to achieve the best performance.

Depending on your data, it might not be a bad idea to have one query per field, and process the results in your app. This way you'll only need indexes on every fields, but it may be too much data to process.