Indexes Indexes support the efficient execution of queries in MongoDB. Without indexes, MongoDB must perform a collection scan, i.e. scan every document in a collection, to select those documents that match the query statement. If an appropriate index exists for a query, MongoDB can use the index to limit the number of documents it must inspect. …
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MongoDB: Improve Performance With Indexes and Covered Queries
It may look like a trivial and basic necessary task to set up indexes on a MongoDB collection, as we often did so on RDBMS’s such as Oracle or MariaDB/MySQL. MongoDB indexes are often misunderstood and I have experienced many incorrect implementations of indexes. As with other DBMS’s, MongoDB indexes have their own specifications. In this article, I …
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