MongoDB – Indexing Limitations In this chapter, we will learn about Indexing Limitations and its other components. Extra Overhead Every index occupies some space as well as causes an overhead on each insert, update and delete. So if you rarely use your collection for read operations, it makes sense not to use indexes. RAM Usage […]
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MongoDB – Regular Expression Regular Expressions are frequently used in all languages to search for a pattern or word in any string. MongoDB also provides functionality of regular expression for string pattern matching using the $regex operator. MongoDB uses PCRE (Perl Compatible Regular Expression) as regular expression language. Unlike text search, we do not need […]
MongoDB – Map Reduce As per the MongoDB documentation, Map-reduce is a data processing paradigm for condensing large volumes of data into useful aggregated results. MongoDB uses mapReduce command for map-reduce operations. MapReduce is generally used for processing large data sets. MapReduce Command Following is the syntax of the basic mapReduce command − >db.collection.mapReduce( function() […]