reIndex

Definition

reIndex

Deprecated since version 6.0.

Attempting to run the reIndex command writes a warning message to the log.

Tip

In mongosh, this command can also be run through the db.collection.reIndex() helper method.

Helper methods are convenient for mongosh users, but they may not return the same level of information as database commands. In cases where the convenience is not needed or the additional return fields are required, use the database command.

The reIndex command drops all indexes on a collection and recreates them. This operation may be expensive for collections that have a large amount of data and/or a large number of indexes.

Warning

• reIndex may only be run on standalone instances.

• For most users, the reIndex command is unnecessary.

Compatibility

This command is available in deployments hosted in the following environments:

• MongoDB Enterprise: The subscription-based, self-managed version of MongoDB

• MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB

Syntax

The command has the following syntax:

db.runCommand(
   {
     reIndex: <collection>
   }
)

Command Fields

The command takes the following fields:

Behavior

For MongoDB 5.0 or later, reIndex may only be run on standalone instances.