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Q 1 - A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
The maximum BSON document size is 16 megabytes. The maximum document size helps ensure that a single document cannot use excessive amount of RAM or, during transmission, excessive amount of bandwidth.
Q 3 - In our posts collection, which command can be used to find all the posts whose author names begin lie between “A” and “C” in dictionary order?
The Update if Current pattern is an approach to concurrency control when multiple applications have access to the data.
Q 7 - In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal as well as acknowledged by at least 3 nodes. What should be the value of w?
The group command in MongoDB groups documents in a collection by the specified key and performs simple aggregation functions, such as computing counts and sums. It is the most basic one and does not support such sharding concepts.s
Q 9 - The difference between $push and $addToSet is:
$addToSet do not add the item to the given field if it already contains it, on the other hand $push will add the given object to field whether it exists or not.
Q 10 - The _______ operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.
