MongoDB Test

Which MongoDB shell command should you use to back up a database?

MONGODUMP

BACKUP

MONGOBACKUP

RESTORE

Which shell query displays all citizens with an age greater than or equal to 21?

DB.CITIZENS.FIND('WHERE AGE >= 21')

DB.CITIZENS.WHERE('AGE >= 21')

DB.CITIZENS.FIND({AGE: {$GTE: 21}})

DB.CITIZENS.SELECT('WHERE AGE >= 21')

What does a MongoDB collection consist of?

FIELDS

DATA

ROWS

DOCUMENTS

Given an ObjectId in _id, how do you get the time it was created?

GETDATETIME(_ID)

_ID.CREATEDATE()

_ID.GETDATETIME()

_ID.GETTIMESTAMP()

Given a cursor named myCursor, which command returns a boolean value?

MYCURSOR.HASNEXT()

MYCURSOR.NEXT()

MYCURSOR.SORT()

MYCURSOR.FIND()

Which command returns a specific document in the user's collection?

DB.USERS.QUERY({_ID: 1})

DB.QUERY.USERS({_ID: 1})

DB.USERS.SEEK({_ID: 1})

DB.USERS.FIND({_ID: 1}

To import a JSON array into Mongo, what flags are needed with MongoDBimport?

--TYPE JSON

--JSON

--JSONARRAY

--TYPE JSONARRAY

Choose the shell command that connects to a MongoDB database.?

MONGO

DBCONNECT

MONGOD

MONGOCONNECT

In the MongoDB shell, how can you tell if an index was used with a query?

DB.CUSTOMERS.FIND({LASTNAME: 'SMITH'}).EXPLAIN()

DB.CUSTOMERS.FIND({LASTNAME: 'SMITH'}).USEDINDEX()

DB.CUSTOMERS.FIND({LASTNAME: 'SMITH'}).PERF()

DB.CUSTOMERS.FIND({LASTNAME: 'SMITH'}).PLAN()

Suppose your aggregation pipeline terminated with an exception referring to exceeded memory limit. What is the best way to resolve the issue?

SWITCH A 64 BIT INSTANCE OF MONGODB.

INCREASE THE MEMORY OF THE MONGODB SERVER.

SET USEMEMORY TO TWICE AMOUNT INDICATED IN EXCEPTION.

SET ALLOWDISKUSE TO TRUE.

What is the recommended way to delete a user?

DB.DROPUSER("USER")

DB.REMOVE("USER")

DB.DELETEUSER("USER")

DB.REMOVEUSER("USER")

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

ONCE THE PRIMARY HAS BEEN DOWN FOR 10 MINUTES

ONCE THE PRIMARY REBOOTS

AFTER THE ADMINISTRATOR REBOOTS THE PRIMARY

IMMEDIATELY

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

--SETAUTHENTICATION=GSSAPI

--SETPARAM AUTH=K

--SETPARAMETER AUTHENTICATIONMECHANISMS=GSSAPI

--SETAUTH METHOD=KERBEROS

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

IT REBOOTS THE FAILED SERVER.

IT MONITORS REPLICA SET AND SENDS EMAIL IN CASE OF FAILURE.

IT CASTS THE TIE-BREAKING VOTE IN AN ELECTION.

IT HOLDS A BACKUP COPY OF THE DATABASE.

You would like to know how many types of items you have in each category. Which query does this?

DB.PRODUCT.AGGREGATE({$SUM: {_ID: "$CATEGORY", COUNT: {$GROUP:1}}})

DB.PRODUCT.GROUP({_ID: "$CATEGORY", COUNT: {$SUM:1}})

DB.PRODUCT.AGGREGATE({$GROUP: {_ID: "$CATEGORY", COUNT: {$SUM:1}}})

DB.PRODUCT.AGGREGATE({$COUNT: {_ID: "$CATEGORY", COUNT: {$SUM:1}}})

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

SKIP

MAX

TAKE

LIMIT

We have a collection named restaurants with the geographical information stored in the location property, how do we create a geospatial index on it?

DB.RESTAURANTS.GEOSPATIAL({LOCATION: "2DSPHERE"})

DB.RESTAURANTS.CREATEINDEX("2DSPHERE":"LOCATION")

DB.RESTAURANTS.CREATEINDEX({GEOSPATIAL: "LOCATION"})

DB.RESTAURANTS.CREATEINDEX({LOCATION: "2DSPHERE"})

How do you find documents with a matching item in an embedded array?

DB.CUSTOMERS.FIND({"JOBS":"SECRETARY"})

DB.CUSTOMERS.FIND({"JOBS":["SECRETARY"]})

DB.CUSTOMERS.FINDMATCH({"JOBS":"SECRETARY"})

DB.CUSTOMERS.FIND({"JOBS:SECRETARY"})

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

DB.CUSTOMERS.FIND({}).SKIP(5).TAKE(10)

DB.CUSTOMERS.FIND({}, {SKIP: 5, LIMIT: 10})

DB.CUSTOMERS.FIND({}).PAGE(5).TAKE(10)

DB.CUSTOMERS.FIND({}).SKIP(5).LIMIT(10)

How do you create a text index?

DB.CUSTOMERS.CREATEINDEX({FIRSTNAME: "TEXT", LASTNAME: "TEXT"})

DB.CUSTOMERS.CREATEINDEX({FIRSTNAME, LASTNAME})

DB.CUSTOMERS.CREATETEXT({FIRSTNAME: 1, LASTNAME: 1})

DB.CUSTOMERS.CREATETEXTINDEX({FIRSTNAME, LASTNAME})

One of the documents in your collection has an _id based upon an older database design and you want to change it. You write an update command to find the document and replace the _id, but the _id isn't changed. How should you fix the issue?

YOU CAN'T. ONCE SET, THE _ID FIELD CANNOT BE CHANGED.

USE THE UPDATEONE() COMMAND INSTEAD.

SET THE REPLACE OPTION TO TRUE.

USE THE REPLACEONE() COMMAND INSTEAD.

Why are ad-hoc queries useful?

THEY RUN FASTER THAN INDEXED QUERIES.

THEY AUTOGENERATE REPORTS.

THEY DO NOT HAVE TO USE THE SAME OPERATORS.

YOU DO NOT NEED TO STRUCTURE THE DATABASE TO SUPPORT THEM

How often do the members of a replica set send heartbeats to each other?

EVERY 10 SECONDS

EVERY 2 MINUTES

EVERY 5 SECONDS

EVERY 2 SECONDS

Which command returns all of the documents in the customers collection?

DB.FIND().CUSTOMERS();

DB.CUSTOMERS.FIND();

DB.CUSTOMERS.SHOW()

DB.CUSTOMERS.ALL()

Given a cursor named myCursor, pointing to the customers collection, how to you get basic info about it?

MYCURSOR.EXPLAIN()

MYCURSOR.INFO()

MYCURSOR.DUMP()

MYCURSOR.STATS()

What is true about indexes?

THEY SPEED UP READ ACCESS WHILE SLOWING DOWN WRITES.

THEY SECURE THE DATABASE FROM INTRUDERS.

THEY SPEED UP READS AND WRITES.

THEY SPEED UP WRITE ACCESS WHILE SLOWING DOWN READS.

What is the preferred format to store geospatial data in MongoDB?

LATITUDE, LONGITUDE

XML

GEOJSON

BSON

Which programming language is used to write MongoDB queries?

PYTHON

SQL

JAVASCRIPT

TYPESCRIPT

You have two text fields in your document, and you'd like both to be quickly searchable. What should you do?

CREATE A TEXT INDEX ON EACH FIELD.

MONGODB IS NOT ABLE TO DO THIS.

CREATE A COMPOUND TEXT INDEX USING BOTH FIELDS.

CREATE A TEXT INDEX ON ONE FIELD AND A SINGLE FIELD INDEX ON THE OTHER.

To import a CSV file into MongoDB, which command should you issue?

MONGOIMPORT

MONGORESTORE

UPLOAD

MONGOI

In an MongoDB mapReduce command, the reduce function should _____.?

NOT ACCESS THE DATABASE

ACCESS THE DATABASE

ACCESS THE DATABASE ONLY TO PERFORM READ OPERATIONS

BE CALLED ONLY WHEN THE KEY HAS A SINGLE VALUE

On a newly created collection, which field will have an index?

THE NAME FIELD

THE OBJECTID FIELD

NO FIELD WILL HAVE AN INDEX

THE _ID FIELD

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Exam Type:	MongoDB MCQ Skill Test
Questions Type:	Multiple Choice Questions
Total Questions:	32
Time Limit:	30 Minutes
Last Update	June, 2025

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