This certification validates practical skills in database management, including data preparation, analysis, governance, and communicating reliable insights. It is intended for professionals who build or operate data-driven solutions.
What is the best practice for connecting to a MongoDB cluster with the Java Driver?
A collection coll has the following documents:
{_id: 4, type: “A”, value: 60}
{_id: 5, type: “B”, value: 80}
{_id: 6, type: “A”, value: 30}
A collection results has the following documents:
{_id: 1, type: “A”, value: 10}
{_id: 2, type: “B”, value: 20}
{_id: 3, type: “C”, value: 30}
After executing the following aggregation pipeline:
db.coll.aggregate([
{ $match: { type: “A” }},
{ $out: ‘results’} ])
What is the result?
In an employee collection, each document represents an employee of the company.
What data model is the most effective for tracking the relationship between an employee and their manager?
Given the following query:
db.coll.find({}).sort({“timestamp”: -1, “status”: 1})
Which two indexes will most improve the performance of this query? (Choose two.)
What Java code is a valid aggregation projection that can be used with collection.aggregate(pipeline)?