[2023年更新]C100DEVリアルな試験問題集でC100DEV練習テスト [Q96-Q113]

[2023年更新]C100DEVリアルな試験問題集でC100DEV練習テスト

C100DEV問題集でMongoDB Certified Developer Associate高確率練習問題集

質問 # 96
You have a configuration file for mongod instance called mongod.conf in your working directory. How can you launch mongod instance with this configuration file?

A. mongod -f mongod.conf
B. mongod --conf mongod.conf
C. mongod --config mongod.conf
D. mongod --use mongod.conf

正解：A、C

解説：
https://docs.mongodb.com/manual/reference/configuration-options/#use-the-configuration-file

質問 # 97
Select all true statements regarding to the _id field in MongoDB documents. (select 4)

A. The _id can be an array data type.
B. MongoDB adds an _id field to any inserted document if it doesn't have one.
C. When inserting a document, the _id value is already generated as an ObjectId type, if not directly specified.
D. We can select a non ObjectId type value for _id field when inserting a new document.
E. The _id values must be unique for the collection.

正解：B、C、D、E

解説：
https://docs.mongodb.com/manual/core/document/ https://docs.mongodb.com/manual/reference/method/ObjectId/

質問 # 98
Which cursor method should you use to force MongoDB to use a specific index for a query?

A. cursor.index()
B. cursor.use()
C. cursor.hint()
D. cursor.explain()

正解：C

解説：
https://docs.mongodb.com/manual/reference/method/cursor.hint/

質問 # 99
You have the following index in a movies collection: { "title": 1, "imdb.rating": -1, "imdb.votes": -1, "type": 1 } Can the following query use the given index for both filtering and sorting?
db.movies.find( { "title": "James Bond", "imdb.rating": { "$gt": 8} } ).sort( { "imdb.rating": 1 } )

A. No
B. Yes

正解：B

解説：
Yes, although this query does not use equality in the "imdb.rating" field of the index prefix, it does use the same field for sorting. https://docs.mongodb.com/manual/indexes/

質問 # 100
Consider the following command: $ mongod --dbpath /data/db --logpath /data/logs --replSet REPL1 --bind_ip '127.0.0.1,192.168.168.84' -- keyFile /data/keyfile --fork Which of the following configuration files is equivalent to the specified command?

A. storage: dbPath: "/data/db" systemLog: destination: file path: "/data/logs" replication: replSetName: "REPL1" net: bindIp: "127.0.0.1,192.168.168.84" processManagement: fork: true
B. storage dbPath="/data/db" systemLog destination=file path="/data/logs" replication replSetName="REPL1" net bindIp="127.0.0.1,192.168.168.84" security keyFile="/data/keyfile" processManagement fork=true
C. storage: dbPath: "/data/db" systemLog: destination: file path: "/data/logs" net: bindIp: "127.0.0.1,192.168.168.84" security: keyFile: "/data/keyfile" processManagement: fork: true
D. storage: dbPath: "/data/db" systemLog: destination: file path: "/data/logs" replication: replSetName: "REPL1" net: bindIp: "127.0.0.1,192.168.168.84" security: keyFile: "/data/keyfile" processManagement: fork: true

正解：D

解説：
https://docs.mongodb.com/manual/reference/configuration-options/

質問 # 101
Suppose you insert the following documents into a companies collection:
db.companies.insertMany([ {"name": "Facebook"}, {"name": "Twitter"} ])
Select all true statements about this command. (select 3)

A. This command will insert two documents into the collection.
B. The _id field is not specified in any of these documents.
C. This command will insert one document into the collection.
D. MongoDB will automatically create an _id field for each document and it will be unique.

正解：A、B、D

解説：
https://docs.mongodb.com/manual/reference/method/db.collection.insertMany/

質問 # 102
Select all true statements about query plans in MongoDB. (select 2)

A. If there are no indexes for the query, the main stage in the query plan will be the COLLSCAN stage.
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. For a given query, each index in the collection generates at least one query plan.

正解：A、B

解説：
https://docs.mongodb.com/manual/core/query-plans/

質問 # 103
Suppose you have a mobile_games collection with the following document structure:
{ game: "Fishing Clash", company: "Ten Square Games", platforms: ['Android', 'IOS'], ...
release_USA: ISODate("2017-04-09T01:00:00+01:00"),
release_France: ISODate("2017-04-09T01:00:00+01:00"),
release_Italy: ISODate("2017-08-17T01:00:00+01:00"), ... }
You want to redesign your document structure as below:
{ game: "Fishing Clash", company: "Ten Square Games", platforms: ['Android', 'IOS'],
releases: [ { location: "USA", date: ISODate("2017-04-09T01:00:00+01:00") },
{ location: "France", date: ISODate("2017-04-09T01:00:00+01:00") },
{ location: "Italy", date: ISODate("2017-08-17T01:00:00+01:00") }, ], }
Which pattern solution will you use to solve this problem?

A. The Extended Reference Pattern.
B. The Bucket Pattern.
C. The Schema Versioning Pattern.
D. The Subset Pattern.
E. The Attribute Pattern.

正解：E

解説：
https://www.mongodb.com/blog/post/building-with-patterns-the-attribute-pattern

質問 # 104
Select properly used $out operator.

A. db.collection.aggregate([ { $out: "new_collection" }, { stage1 }, { stage2 }, ..., { $stageN } ])
B. db.collection.aggregate([ { stage1 }, { stage2 }, ..., { stageN }, { $out: "new_collection" } ])
C. db.collection.aggregate([ { stage1 }, { $out: "new_collection" }, { stage2 }, ..., { stageN } ])

正解：B

解説：
https://docs.mongodb.com/manual/reference/operator/aggregation/out/

質問 # 105
Which cursor method should you use to return the number of documents in the result set?

A. cursor.sum()
B. cursor.explain()
C. cursor.total()
D. cursor.count()

正解：D

解説：
https://docs.mongodb.com/manual/reference/method/db.collection.count/

質問 # 106
Which of the following statements are true regarding MongoDB views?

A. MongoDB views themselves don't contain data.
B. MongoDB views are created on demand and reflect the data in the source collection.
C. Views are write only.
D. Write operations to views will raise an error.
E. Views are read only.

正解：A、B、D、E

解説：
https://docs.mongodb.com/manual/core/views/

質問 # 107
What is the built-in database called config in MongoDB for?

A. The config database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.
B. The config database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.
C. The config database is used to store information about shards in shared MongoDB cluster.

正解：C

解説：
https://docs.mongodb.com/manual/reference/config-database/

質問 # 108
Which of the following queries can use an index on the title field?

A. db.movies.find( { title: "Death Note" } )
B. db.movies.find()
C. db.movies.find( { _id: 245 } )
D. db.movies.find()
E. db.movies.find( { genres: "Drama", type: "series" } )

正解：A

解説：
https://docs.mongodb.com/manual/indexes/

質問 # 109
The following capped collection is given: db.createCollection('latest_news', {'capped': true, 'size': 10000, 'max': 3}) [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' } ] What the latest_news collection will look like after the following operation?

A. db.latest_news.insertOne({title: 'TikTok owner ByteDance dissolves its investment arm'}) [ { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' }, { _id: ObjectId("61e801439b3067e362440a8b"), title: 'TikTok owner ByteDance dissolves its investment arm' } ]
B. [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' } ]
C. [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' }, { _id: ObjectId("61e801439b3067e362440a8b"), title: 'TikTok owner ByteDance dissolves its investment arm' } ]

正解：A

解説：
https://docs.mongodb.com/manual/core/capped-collections/

質問 # 110
Select true statements regarding to MongoDB. Check all that apply.

A. MongoDB database organizes documents in rows and columns.
B. Documents in MongoDB are organized into collections.
C. MongoDB is a NoSQL database that uses documents to store data in an organized way.

正解：B、C

解説：
https://www.mongodb.com/what-is-mongodb

質問 # 111
Select all valid BSON types in MongoDB. (select 4)

A. Boolean
B. String
C. Dictionary
D. Array
E. ObjectId

正解：A、B、D、E

解説：
https://docs.mongodb.com/manual/reference/bson-types/

質問 # 112
Select all options where you should use sharding.

A. You have over 6TB per server and operating costs are increasing dramatically.
B. Every time you start a new project with MongoDB.
C. Your server disks are full, but you can scale up.
D. Your organization outgrows the most powerful servers available, which limits your vertical scaling capabilities.

正解：A、D

解説：
https://docs.mongodb.com/manual/sharding/

質問 # 113
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