Prerequisites: MongoDB Python Basics
This article is about displaying the information of Collection’s indexes using the index_information() function of the PyMongo module.
index_information() returns a dictionary where the keys are index names (as returned by create_index()) and the values are dictionaries containing information about each index. The dictionary is guaranteed to contain at least a single key, “key” which is a list of (key, direction) pairs specifying the index (as passed to create_index()). It will also contain any other metadata about the indexes, except for the “ns” and “name” keys, which are cleaned.
Let’s begin:
- Importing Required Modules: Import the required module using the command:
from pymongo import MongoClient
If MongoDB is already not installed on your machine you can refer to the guide: Guide to Install MongoDB with Python
- Creating a Connection: Now we had already imported the module, its time to establish a connection to the MongoDB server, presumably which is running on localhost (host name) at port 27017 (port number).
client = MongoClient(‘localhost’, 27017)
- Accessing the Database: Since the connection to the MongoDB server is established. We can now create or use the existing database.
mydatabase = client.name_of_the_database
- Accessing the Collection: We now select the collection from the database using the following syntax:
collection_name = mydatabase.name_of_collection
- Getting the information of the indexes: Using the function index_information to get the information of all the indexes of the collection.
collection_name.index_information()
Example:
Sample Database:
# Python Program for demonstrating the # PyMongo Cursor to Pandas DataFrame # Importing required modules from pymongo import MongoClient from pandas import DataFrame # Connecting to MongoDB server # client = MongoClient('host_name', # 'port_number') client = MongoClient('localhost', 27017) # Connecting to the database named # GFG mydatabase = client.GFG # Accessing the collection named # Student mycollection = mydatabase.Student # Displaying the information of all the indexes # using the function index_information() ind_info = mycollection.index_information() print(ind_info) |
Output:
{‘_id_’: {‘v’: 2, ‘key’: [(‘_id’, 1)], ‘ns’: ‘GFG.Student’}, ‘Roll No_1’: {‘v’: 2, ‘unique’: True, ‘key’: [(‘Roll No’, 1)], ‘ns’: ‘GFG.Student’}}
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