The query below returns a collection of users with a projection db.users.find({}, {name: 1, _id : 1}) Choose the best statement that describes how to extract a collection of users with the projection that shows the creation date

Which is a correct command to insert a document in a database called album and collection called songs?

Which is captured by the Database Profiler in MongoDB ?

For a collection that represents type A { 'field1' : 'val1', 'field2' : 'val2' } Choose the best way to optimize the collection for updates if field2 is an Enumeration.

For a mongo mapreduce flow, the emit function has the form emit(this.cId, {q1:this.Q1, q2s:this.Q2}); Choose the correct return value for the reduce function

Which field DBRefs has?

Which SQL terminilogy is same as $match in MongoDB?

Which operation on a single document will operate atomically?

Choose the best description of why MongoDB performs well on a non heterogeneous cluster:

___ filters the document stream to allow only matching documents to pass unmodified into the next pipeline stage.

Which operator is related to geography of data ?