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最新的C100DEV最新考古題|高通過率的考試材料|完美的C100DEV熱門考古題

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    >> C100DEV最新考古題 <<

    C100DEV熱門考古題 - C100DEV試題

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    最新的 MongoDB Certified Developer Associate C100DEV 免費考試真題 (Q157-Q162):

    問題 #157
    We have an accounts collection with the following document structure: { _id: ObjectId("5ca4bbc7a2dd94ee5816239d"), account_id: 864905, limit: 10000, products: [ 'Commodity', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239e"), account_id: 299072, limit: 10000, products: [ 'InvestmentFund', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239f"), account_id: 137994, limit: 10000, products: [ 'CurrencyService', 'InvestmentStock' ] } We need to use Aggregation Framework to find the distribution of products field. Sort the result set by decreasing total number of products. Expected output: [ { _id: 'InvestmentStock', total: 1746 }, { _id: 'CurrencyService', total: 742 }, { _id: 'Brokerage', total: 741 }, { _id: 'InvestmentFund', total: 728 }, { _id: 'Commodity', total: 720 }, { _id: 'Derivatives', total: 706 } ] Which pipeline should you use?

    • A. [{ $unwind: { path: "products" } }, { $group: { _id: "products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]
    • B. [{ $unwind: { path: "$products" } }, { $group: { _id: "$products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]
    • C. [{ $group: { _id: "$products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]

    答案:B

    解題說明:
    https://docs.mongodb.com/manual/aggregation/


    問題 #158
    Which of the following processes are heavily reliant on available CPU?

    • A. Read operations
    • B. Aggregation
    • C. Write operations

    答案:A,B,C


    問題 #159
    You have to create a simple configuration file for mongod instance. Here are the requirements of your mongod instance: * stores data files in /var/mongo/db * listens to connection from localhost * runs on port 27000 * uses authentication Which of the following configuration file meet these requirements?

    • A. storage:
      dbPath: /var/mongodb/db
      security:
      authorization: enabled
    • B. storage:
      dbPath: /var/mongodb/db
      net:
      bindIp: localhost
      port: 27000
    • C. net:
      bindIp: localhost
      port: 27000
      security:
      authorization: enabled
    • D. storage:
      dbPath: /var/mongodb/db
      net:
      bindIp: localhost
      port: 27000
      security:
      authorization: enabled

    答案:C

    解題說明:
    https://docs.mongodb.com/manual/reference/configuration-options/


    問題 #160
    Select true statements about the selection of the shard key.

    • A. Monotonically changing shard keys result in write operations going to a single shard. This is inefficient.
    • B. High frequency - most documents fall within a particular range. This can lead to bottleneck problems within the cluster.
    • C. High cardinality provides more shard key values, which determines the maximum number of chunks the balancer can create.
    • D. Non-monotonic data is a good choice for shard key.

    答案:A,B,C,D

    解題說明:
    https://docs.mongodb.com/manual/core/sharding-shard-key/


    問題 #161
    A collection called players contains the following documents:
    [ { _id: 1, user: 'Tom', scores: [ 23, 56, 3, 52, 62 ], bonus: 5 }, { _id: 2, user: 'Jane', scores: [ 42, 50, 10 ], bonus: 3 } ]
    You want to add additional fields to each document:
    -> total_score (sum of the scores Array) -> avg_score (average score in scores Array) -> total_score_with_bonus (total_score + bonus) Expected output: [ { _id: 1, user: 'Tom', scores: [ 23, 56, 3, 52, 62 ], bonus: 5, total_score: 196, avg_score: 39.2, total_score_with_bonus: 201 }, { _id: 2, user: 'Jane', scores: [ 42, 50, 10 ], bonus: 3, total_score: 102, avg_score: 34, total_score_with_bonus: 105 } ]
    Which query do you need to use?

    • A. db.players.aggregate([{ $addFields: { total_score: { $sum: '$scores' }, avg_score: { $avg: '$scores' }, total_score_with_bonus: { $add: ['$total_score', '$bonus'] } } }])
    • B. db.players.aggregate([{ $addFields: { total_score: { $sum: '$scores' }, avg_score: { $avg: '$scores' } } }, { $addFields: { total_score_with_bonus: { $add: ['$total_score', '$bonus'] } } }])

    答案:B

    解題說明:
    https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/ https://docs.mongodb.com/manual/reference/operator/aggregation/addFields/


    問題 #162
    ......

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