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Docs Home → Develop Applications → MongoDB Manual


CREATE AN INDEX


On this page

 * About this Task
 * Procedure
 * Example
 * Results
 * Learn More

Indexes support efficient execution of queries in MongoDB. If your application
is repeatedly running queries on the same fields, you can create an index on
those fields to improve performance for those queries.

To create an index, use the createIndex() shell method or equivalent method for
your driver. This page shows examples for the MongoDB Shell and drivers.


ABOUT THIS TASK


When you run a create index command in the MongoDB Shell or a driver, MongoDB
only creates the index if an index of the same specification does not exist.

Although indexes improve query performance, adding an index has negative
performance impact for write operations. For collections with a high
write-to-read ratio, indexes are expensive because each insert and update must
also update any indexes.


PROCEDURE


--------------------------------------------------------------------------------

➤ To set the language of the examples on this page, use the Select your language
drop-down menu in the right navigation pane.

--------------------------------------------------------------------------------


MongoDB Shell
C#
Java (Async)
Java (Sync)
Motor
Node.js
Perl
PHP
Python
Ruby
Scala

To create an index using the Node.JS driver, use createIndex().

collection.createIndex( { <key and index type specification> }, function(err, result) {   console.log(result);   callback(result);}

Node.js








EXAMPLE



MongoDB Shell
C#
Java (Async)
Java (Sync)
Motor
Node.js
Perl
PHP
Python
Ruby
Scala

This example creates a single key descending index on the name field:

 collection.createIndex( { name : -1 }, function(err, result) {   console.log(result);   callback(result);}

Node.js








NOTE


INDEX SORT ORDER

For a single-field index, the sort order (ascending or descending) of the index
key does not matter because MongoDB can traverse the index in either direction.


RESULTS


To confirm that the index was created, use mongosh to run the
db.collection.getIndexes() method:

db.collection.getIndexes()



Output:

[  { v: 2, key: { _id: 1 }, name: '_id_' },  { v: 2, key: { name: -1 }, name: 'name_-1' }]

To view information on created indexes using a driver, refer to your driver's
documentation.


LEARN MORE


 * To learn how to create indexes in MongoDB Compass, see Manage Indexes in the
   Compass documentation.

 * To see how often your indexes are used, see Measure Index Use.

 * To learn how to specify the name of your index, see Specify an Index Name.

 * To learn how MongoDB builds indexes, see Index Build Process.

←  IndexesSpecify an Index Name →
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