Multi‐Document Transaction

Multi-Document Transactions

ACID transactions in MongoDB are typically used only by applications where values are exchanged between different parties, such as banking or business applications. If you find yourself in a scenario where a multi-document transaction is required, it's very likely that you will complete a transaction with one of MongoDB's drivers. For now, let's focus on completing and canceling multi-document transactions in the shell to become familiar with the steps.

Using a Transaction: Video Code

Here is a recap of the code that's used to complete a multi-document transaction:

const session = db.getMongo().startSession()

session.startTransaction()

const account = session.getDatabase('< add database name here>').getCollection('<add collection name here>')

//Add database operations like .updateOne() here

session.commitTransaction()

Aborting a Transaction

If you find yourself in a scenario that requires you to roll back database operations before a transaction is completed, you can abort the transaction. Doing so will roll back the database to its original state, before the transaction was initiated.

Aborting a Transaction: Video Code

Here is a recap of the code that's used to cancel a transaction before it completes:

const session = db.getMongo().startSession()

session.startTransaction()

const account = session.getDatabase('< add database name here>').getCollection('<add collection name here>')

//Add database operations like .updateOne() here

session.abortTransaction()