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

The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

A. $

B. $slice

C. Updating an array field without knowing its index is not possible.

D. $ elemMatch

正解：A 解答を投票する

出題：2

In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

A. Skips the first five documents and returns the next five

B. Skips the first five documents and returns the sixth document five times

C. Limits the first five documents and then return them in reverse order

D. Skip and limit nullify each other. Hence returning the first five documents.

正解：A 解答を投票する

出題：3

Which of the following is correct about MongoDB?

A. MongoDB uses JSON format to represent documents

B. MongoDB supports some of the SQL functions

C. MongoDB supports collection joins

D. MongoDB supports geospatial indexes

正解：D 解答を投票する

出題：4

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

A. mongodump

B. mongostat

C. mongotop

D. mongorestore

正解：B 解答を投票する

出題：5

What is the use of mongodump and mongorestore tools?

A. replicate mongodb deployments

B. audit mongodb deployment

C. backup mongodb deployment

D. performance tune mongodb deployment

正解：C 解答を投票する

出題：6

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?

A. 2

B. 1

C. 0

D. 7

正解：B 解答を投票する

出題：7

Which operations add new documents to a collection?

A. Create

B. update

C. insert

D. delete

正解：A,C 解答を投票する

出題：8

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?

A. {update: true, insert: true} as the third parameter of update command

B. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query

C. Specify {upsert : true } as the third parameter of update command

D. upsert command instead of update command

正解：C 解答を投票する

出題：9

Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?

A. To protect agains network partitions

B. To add greather redundancy

C. To enable certain read preference settings

D. For more efficient backup operations

E. To help in disaster recovery

正解：A 解答を投票する

出題：10

What is the defau size of a GridFS chunk?

A. 2 MB

B. 16 MB

C. 255 K

D. 1 MB

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」