MongoDB Transactions with Python

Implement a Transaction to Update Multiple Collections

Write a Python script using PyMongo that transfers inventory items between two warehouses atomically using a transaction.

Expected output: Both warehouses' inventory counts are updated atomically, or no changes occur if an error happens.

Hint: Use client.start_session() and session.start_transaction(), and pass the session parameter to update operations.

A MongoDB transaction allows multiple operations across one or more documents and collections to execute atomically. It is useful to maintain data consistency and integrity in complex operations.

You start a transaction by creating a client session with client.start_session(), then calling session.start_transaction(), and performing operations with the session parameter.

Transactions are supported on replica sets starting from MongoDB 4.0 and on sharded clusters starting from MongoDB 4.2. Standalone servers do not support transactions.