Which of the following about Capped Collections is correct?

• A.Fixed Size
• B.If the allocated space for a capped collection exceeds, it stops inserting new documents
• C.High-throughput operations that insert and retrieve documents based on insertion order
• D.Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"

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Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

• A.db.posts.find({},{_id:Of post_text:1})
• B.db.posts.finOne{},{post_text:l})
• C.db.posts.findOne({post_text: 1})
• D.db.posts.finOne({},{_id:0, post_text:1})

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'mongoimport' command is used for

• A.Multiple command insertion
• B.None of the above
• C.Batch data insertion
• D.Multiple command import

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Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

• A.$removeFromSet
• B.$arrayLimit
• C.$push along with $each, $sort and $slice
• D.None of the above

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

• A.mongodump
• B.mongotop
• C.mongostat
• D.mongorestore

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