mongodb sparse index performance

First, the index introductionIn MongoDB, indexes are used to support efficient queries. If there is no index, MONGODB must scan each document in the entire collection to find a matching document. However, if an appropriate index is established,

Indexes can often greatly improve the efficiency of queries, and if there is no index, MongoDB must scan every file in the collection and select those records that meet the query criteria when reading the data. This scan full set of query efficiency

Previous wordsIndexes can often greatly improve the efficiency of queries, and if there is no index, MongoDB must scan every file in the collection and select those records that meet the query criteria when reading the data. This scan full set of

MongoDB data model and index learning summary, mongodb ModelMongoDB data model and index learning Summary 1. MongoDB Data Model: MongoDB data storage structure:MongoDB uses BSON (binary json, binary encoding) data format for document (large files

One, index type (a), one -touch index The index created on one key is the one-touch index, and the single key index is the most common index, such as the _id index created by default by MongoDB. (ii), composite index Indexes built on multiple keys

/*** MongoDB $type operator*/ /*** The $type operator is based on the Bson type to retrieve the matching data type in the collection and returns the result.* The types of MongoDB that can be used are shown in the following table:* Type Number Notes*

MongoDB Data Model and Index learning Summary 1. MongoDB Data Model: MongoDB Data storage structure:MongoDB uses Bson (binary JSON, binary encoded) data format to store and exchange data for documents (large files using the GRIDFS protocol).

Index, which allows you to quickly access specific information in a database table. An index is a structure that sorts the values of one or more columns in a database table, such as the name column of the employee table. If you want to search for a

Index, which allows you to quickly access specific information in a database table. An index is a structure used to sort the values of one or more columns in a database table. For example, the name of the employee table Index, which allows you to

This article we are going to share with you the use of MongoDB Index, index is like a book directory, if the search for a content in the absence of the help of the directory, can only look through the entire search, which results in a very low