C100DEV試験無料問題集（253題）「MongoDB Certified Developer Associate 認定」

出題：1

Which of the following actions are granted to the built-in read role?

A. find

B. remove

C. update

D. insert

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：2

What command can you use to create a capped collection named latest_news that will be limited to 3 documents and 10,000 bytes?

A. db.createCollection('latest_news', {'capped': true, 'max': 3})

B. db.createCollection('latest_news', {'capped': true, 'size': 10000, 'max': 3})

C. db.createCollection('latest_news', {'size': 10000, 'max': 3})

正解：B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：3

Select all true statements about replication in MongoDB.

A. It's a good practice to have replicas in different geographical regions. If one region becomes unavailable due to a major failure in a data center or the network connection to it, the applications will continue to run without downtime.

B. Replication is also used to prevent downtime in the event of a failure in a data center.

正解：A,B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：4

Select all true statements about the differences between mongoexport and mongodump.

A. By default, mongodump sends output to stdout, but mongoexport writes to a file.

B. mongoexport outputs JSON file, but mongodump outputs BSON file.

C. mongodump can create a data file and a metadata file, but mongoexport just creates a data file.

D. mongodump is typically faster than mongoexport

E. mongoexport outputs BSON file, but mongodump outputs JSON file.

正解：B,C,D 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：5

How to connect to mongod instance and authenticate as root?

A. mongo --username root --password root123 --authenticationDatabase admin

B. mongo --authenticationDatabase admin

C. mongoroot --authenticationDatabase admin

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：6

Select all true statements regarding to transactions in MongoDB.

A. We cannot read/write to collections in the config, admin, or local databases.

B. Transactions are associated with a session.

C. The collections used in a transaction can be in different databases.

正解：A,B,C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：7

We can use REGEX in our queries in MongoDB - JavaScript regular expression syntax.

A. True

B. False

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：8

We have a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd6223"), genres: [ 'Comedy', 'Drama', 'Family' ], title: 'The Poor Little Rich Girl', released: ISODate("1917-03-05T00:00:00.000Z"), year: 1917, imdb: { rating: 6.9, votes: 884, id: 8443 } } We need to extract all movies from this collection where genres includes both 'Crime' and 'Mystery'. Which query should we use?

A. db.movies.find( { genres: { $any: ["Crime", "Mystery"] } } )

B. db.movies.find( { genres: { $nin: ["Crime", "Mystery"] } } )

C. db.movies.find( { genres: { $in: ["Crime", "Mystery"] } } )

D. db.movies.find( { genres: { $all: ["Crime", "Mystery"] } } )

正解：D 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：9

Select all true statements about query plans in MongoDB. (select 2)

A. For a given query, each index in the collection generates at least one query plan.

B. Query plans are cached so that plans don't have to be generated and compared with each other each time a query is executed.

C. If there are no indexes for the query, the main stage in the query plan will be the COLLSCAN stage.

正解：B,C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：10

You have the following replica set configuration: conf = { "_id": "replset", "version": 1, "protocolVersion": 1, "members": [ { "_id": 0, "host": "192.168.120.24:27017", "priority": 2, "votes": 1 }, { "_id": 1, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 }, { "_id": 2, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 } ] } Select all true statements about this configuration.

A. This configuration is incorrect. Host information must be unique for each member in a replica set.

B. This configuration is incorrect. You can only specify a priority of 0 or 1.

C. This configuration is correct.

D. This configuration is incorrect. Replica set cannot have three members.

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：11

We have a restaurants collection with the following document structure: { _id: ObjectId("5eb3d668b31de5d588f42a7d"), address: { building: '605', coord: [ -74.0060152, 40.7372653 ], street: 'Hudson Street', zipcode: '10014' }, cuisine: 'French', grades: [ { date: ISODate("2014-06-30T00:00:00.000Z"), grade: 'A', score: 10 }, { date: ISODate("2013-05-20T00:00:00.000Z"), grade: 'A', score: 13 }, { date: ISODate("2012-12-11T00:00:00.000Z"), grade: 'A', score: 9 } ], name: 'La Ripaille Restaurant' } We need to use Aggregation Framework to calculate the total number of restaurants for top 5 cuisine (sorted in descending order by the number of restaurants). Expected output: [ { _id: 'American', total_restaurants: 6183 }, { _id: 'Chinese', total_restaurants: 2418 }, { _id: 'Cafao/Coffee/Tea', total_restaurants: 1214 }, { _id: 'Pizza', total_restaurants: 1163 }, { _id: 'Italian', total_restaurants: 1069 } ] Which pipeline should you use?

A. [{ $group: { _id: "$cuisine", total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: 1 } }, { $limit: 5 }]

B. [{ $group: { _id: "cuisine", total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: -1 } }, { $limit: 5 }]

C. [{ $group: { _id: "$cuisine", total_restaurants: { $sum: 1 } } }, { $limit: 5 }, { $sort: { total_restaurants: -1 } }]

D. [{ $group: { _id: "$cuisine", total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: -1 } }, { $limit: 5 }]

正解：D 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：12

Given a movies collection where each document has the following structure: { _id: ObjectId('573a1390f29313caabcd60e4'), genres: [ 'Short', 'Comedy', 'Drama' ], title: 'The Immigrant', year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 }, countries: [ 'USA' ] } Which of the following queries will find all the movies that have more votes than the year in which they were released?

A. db.movies.find({ $expr: { $lt: ["$imdb.votes", "$year"] } } )

B. db.movies.find({ $expr: { $gt: ["$imdb.votes", "$year"] } } )

C. db.movies.find({ $expr: { $gt: ["imdb.votes", "year"] } } )

正解：B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

C100DEV試験無料問題集「MongoDB Certified Developer Associate 認定」