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MongoDB Manual

Drop an Index

On this page

  • About this Task
  • Before You Begin
  • Procedures
  • Drop a Single Index
  • Drop Multiple Indexes
  • Drop All Indexes Except the _id Index
  • Results
  • Learn More

You can remove a specific index from a collection. You may need to drop an index if you see a negative performance impact, want to replace it with a new index, or no longer need the index.

To drop an index, use one of the following shell methods:

Drops a specific index from the collection.
Drops all removable indexes from the collection or an array of indexes, if specified.

You can drop any index except the default index on the _id field. To drop the _id index, you must drop the entire collection.

If you drop an index that's actively used in production, you may experience performance degradation. Before you drop an index, consider hiding the index to evaluate the potential impact of the drop.

To drop an index, you need its name. To get all index names for a collection, run the getIndexes() method:


After you identify which indexes to drop, use one of the following drop methods for the specified collection:

To drop a specific index, use the dropIndex() method and specify the index name:


To drop multiple indexes, use the dropIndexes() method and specify an array of index names:

db.<collection>.dropIndexes( [ "<index1>", "<index2>", "<index3>" ] )

To drop all indexes except the _id index, use the dropIndexes() method:


After you drop an index, the system returns information about the status of the operation.

Example output:

{ "nIndexesWas" : 3, "ok" : 1 }

The value of nIndexesWas reflects the number of indexes before removing an index.

To confirm that the index was dropped, run the db.collection.getIndexes() method:


The dropped index no longer appears in the getIndexes() output.

  • To learn more about managing your existing indexes, see Manage Indexes.

  • To learn how to remove an index in MongoDB Compass, see Manage Indexes in Compass.


Specify an Index Name


Index Types