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            MongoDB



            C100DBA







            MongoDB Certified DBA Associate










            https://killexams.com/pass4sure/exam-detail/C100DBA





    Question: 38


    Which are the ONLY ways to project portions of an array?
    A . $slice
    B . $
    C . All of the above
    D . $ elemMatch





    Answer: C

    Question: 39


    Which operations add new documents to a collection?
    A . Create
    B . update
    C . insert
    D . delete





    Answer: A,C

    Question: 40


    The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the
    aggregation pipeline:
    A . $project
    B . $aggregate
    C . $match
    D . $group





    Answer: A

    Question: 41

    Which of the following is true about sharding?
    A . Creating a sharded key automatically creates an index on the collection using that key
    B . We cannot change a shard key directly/automatically once it is set up
    C . A sharded environment does not support sorting functionality since the documents lie on various mongod instances
    D . Sharding is enabled at the database level





    Answer: B

    Question: 42

    MongoDB is


    A . None of the above
    B . Object-oriented DBMS
    C . Relational DBMS
    D . Document-oriented DBMS





    Answer: D

    Question: 43

    Using an arbiter allows one to easily ensure an odd number of voters in replica sets.


    Why is this important?
    A . To help in disaster recovery
    B . To protect agains network partitions
    C . To enable certain read preference settings
    D . To add greather redundancy
    E . For more efficient backup operations





    Answer: B








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