C100DBA MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Questions and Answers

Which are the ONLY ways to project portions of an array?

Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?

Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

You perform the following query on the sayings collection, which has the index

{ quote : "text" }:

Assuming the documents below are in the collection, which ones will the following query return? Check all that

apply.

db.sayings.find( { $text : { $search : "fact find" } } )

Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

Consider the following document:

> db.c.find()

{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }

Which of the following queries on the "c" collection will return only the first five elements of the array in the "b"

field? E.g.,

Document you want returned by your query:

{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?

Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

Which mongodb tool is used to report details on number of database operations in MongoDB?

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

Which of the following operators is used to updated a document partially?

You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

Which option should be used to update all the documents with the specified condition in the MongoDB query?