Q. The _____ JavaScript engine allows multiple JavaScript operations to execute at the same time.

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Q. Point out the correct statement.

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Q. If the ______ field for mapReduce has the sharded value, MongoDB shards the output collection using the _id field as the shard key.

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Q. In MongoDB __________ mongos retrieves the results from each shard, performs a merge sort to order the results.

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Q. Point out the wrong statement.

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Q. Which of the following function follows the reduce method and modifies the output?

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Q. __________ specifies global variables that are accessible in the map.

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Q. MongoDB converts the JavaScript objects emitted by the map function to ________ objects.

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Q. You can only use jsMode for result sets with fewer than 500,000 distinct key arguments to the mapper’s _______ function.

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Q. Which of the following mode defaults to false?

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Q. $dayOfMonth returns the day of the month for a date as a number between ________________

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Q. Point out the wrong statement.

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Q. __________ returns the day of the year for a date as a number between 1 and 366.

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Q. Which of the following returns year for particular date?

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Q. Point out the wrong statement.

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Q. Which of the following returns the hour for a date as a number between 0 and 23?

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Q. __________ returns the date as a formatted string.

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Q. _______ result encompasses instances of undefined values or missing fields.

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Q. ___________ returns either the non-null result of the first expression.

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Q. __________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.

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