# MongoDB index

20 December 2021

Some queries you run with Mongo need an index in order to be run efficiently. In some cases, the index chosen by the engine is not the most efficient one.

You may then suggest using an index with the .hint() method in Python.

c = (
client
.db
.collection
.find(filter_dict, projection_dict)
.hint("indexName")
)


For reference, the list of indexes is available as:

client.db.collection.index_information()


and information about chosen indexes can be analysed with the explain() method:

c = client.db.collection.find(filter_dict, projection_dict).explain()