Context

In Django's database backend system, the BaseDatabaseWrapper class provides a foundation for creating custom database backends. One of its key methods, get_new_connection, handles database connections.

Currently, in django-mongodb-backend, a new MongoClient object is created for each request when get_new_connection, and Django closes this connection after the request completes. This approach is inefficient because it incurs the overhead of reestablishing a database connection for every HTTP request.

A better solution would be to leverage PyMongo's built-in connection pooling. This would maintain persistent connections, reduce connection setup overhead, and improve performance by reusing existing connections rather than creating new ones for each request.