mongoDB : Indexing

A database index is a data structure that improves the speed of data retrieval operations on a database collection at the cost of additional writes and storage space to maintain the index data structure.

Adding appropriate indexes on large collections will typically have the greatest impact on the performance of a database, so that only a small percentage of queries need to scan the entire collection. Without indexes, mongoDB must scan every document in the collection that match query statement. MongoDB defines indexes at the collection level and supports indexes on any field or sub-field of the documents in a MongoDB collection.

In ideal situations, you no need to index all the fields in the collection, choose what fields makes your frequent queries for indexing.

Prevoius                                                 Next                                                 Home