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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q64-Q69):

NEW QUESTION # 64
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )
B. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
C. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
D. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: 1 > > >] )

Answer: B

NEW QUESTION # 65
An employees collection contains documents with fields such as _id, name, age, department, and salary.
A database administrator needs to run a query that will return ONLY the name and age fields for all employees.
Which query meets this requirement?

A. db.employees.find({ name: 1, age: 1, _id: 0 }, { })
B. db.employees.find({ name: 1, age: 1 }, { })
C. db.employees.find({ }, { name: 1, age: 1, _id: 0 })
D. db.employees.find({ }, { name: 1, age: 1 })

Answer: C

Explanation:
The first argument to find() is the query filter and the second argument is the projection. Because the requirement applies to every employee, the filter must be an empty document {}. The projection must include name and age while explicitly suppressing _id. MongoDB includes _id by default even in inclusion projections, so { name: 1, age: 1 } would return three fields: _id, name, and age. Adding _id: 0 is the documented exception that allows _id to be excluded from an otherwise inclusion-style projection. Option C therefore produces exactly the requested fields. Options A and B mistakenly place projection-like expressions in the filter position, which would cause MongoDB to search for documents where those fields literally match the specified values rather than controlling returned fields. Option D is close but violates the word "ONLY" because _id remains present. Projection design can also reduce network traffic and, when a suitable index covers both the predicate and projected fields, can contribute to covered-query plans. For this requirement, however, the essential syntax is find({}, {name:1, age:1, _id:0}), so C is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - find(), filters, projections, inclusion fields, and _id exclusion.

NEW QUESTION # 66
Below is a sample document of " orders " collection

Answer:

Explanation:
$sort

NEW QUESTION # 67
Update If Correct is an approach for which of the following concepts in MongoDB:

A. Atomicity
B. Transaction Management
C. Concurrency Control
D. Performance Management

Answer: C

NEW QUESTION # 68
Which TWO commands can be used to check for all active operations on the current node?

A. db.currentOp({ " all " : true })
B. db.currentOp(true)
C. db.adminCommand({ currentOp : true })
D. db.adminCommand({ " all " : currentOp})
E. db.currentOp({ op : " command " })

Answer: B,C

Explanation:
db.currentOp() is the mongosh helper used to inspect operations currently executing on a MongoDB server.
Passing true requests a broad view that includes all in-progress operations as well as additional idle/system entries, so it can be used when the administrator wants to see the complete current-operation picture. The database-command form, db.adminCommand({ currentOp: true }), invokes the corresponding administrative command and is also valid for obtaining in-progress operation information. Option A adds a filter restricting the result to operations whose op field is " command " ; it therefore does not represent all operation types.
Option B is not valid currentOp command syntax, and option E uses an all field that is not the documented special form for this helper. In modern MongoDB administration, the $currentOp aggregation stage is generally preferred for richer filtering and aggregation, but the question is testing the traditional helper and command interfaces. Therefore, C and D are the two valid choices among those presented.
Study Guide reference/topic:Performance Monitoring and Tuning - current operations, currentOp, and administrative diagnostics.

NEW QUESTION # 69
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