C100DBA試験無料問題集（130題）「MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定」

出題：1

Which of the following collections stores authentication credentials in MongoDB?

A. test.users

B. users.users

C. system.users

D. local.users

正解：C 解答を投票する

出題：2

Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

正解：D 解答を投票する

出題：3

When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

A. When the many is very large

B. When the many is not very large

C. Always

D. Never

正解：B 解答を投票する

出題：4

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

A. $project

B. $update

C. $modify

D. $set

正解：D 解答を投票する

出題：5

Which of the following commands can cause the database to be locked?

A. Inserting data

B. Issuing a query

C. All of the above

D. Map-reduce

正解：C 解答を投票する

出題：6

In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

A. Depends on the application architecture

B. Odd

C. 2

D. Even

正解：B 解答を投票する

出題：7

Which is the default mode in which the explain() command runs?

A. allPlansExecution

B. queryPlanner

C. executionStats

D. customExecutionStats

正解：B 解答を投票する

出題：8

If you have created a compound index on (A,B, C) which of the following access pattern will not be able to utilize the index?

A. A

B. A, B, C

C. B, C

D. A, B

正解：C 解答を投票する

出題：9

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?

A. db.posts.createIndex({^commerits.author";-!});

B. db.posts.createIndex({^comments.$.author":-l});

C. db. posts.createIndex({^comments.author" :1});

正解：A 解答を投票する

出題：10

In what format does mongodump creates backup files?

A. XML

B. SOAP

C. BSON

D. JSON

正解：C 解答を投票する

C100DBA試験無料問題集「MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定」