Data updating

There are two forms of specifying a criteria, by named arguments or by passing in an expression.

If a single update operation modifies multiple documents of a collection, the operation can interleave with other write operations on that collection. For all available update operators, see the Update Operators reference page in the Mongo DB Manual.One is when you want to pass only one or two parameters, but the values you want to pass are not among the first positions in the parameter list.Another situation is when you want to make your code more readable by passing the parameters in the order that makes the most sense to you.Challenges include capture, storage, analysis, data curation, search, sharing, transfer, visualization, querying, updating and information privacy.The term "big data" often refers simply to the use of predictive analytics, user behavior analytics, or certain other advanced data analytics methods that extract value from data, and seldom to a particular size of data set.

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