"write concern" allows an application to:

A Priority 0 or "passive" replica member:

"read preference" affects how an application:

All writes in MongoDB Must go the primary

What is the easiest way to do tasks like totaling or averaging field values in MongoDB newer versions?

If you have a compound index on multiple fields (a,b,c), you can use it to query on:

Which query bypasses the first 5 customers and returns the next 10?

To restrict the number of records coming back from a query, which command should you use?

What is the purpose of an arbiter in a replica set?

What is the correct option to set up Kerberos when starting MongoDBd?

What the primary database in a replica set fails, when does failover begin?