javascript
const session = db.getMongo().startSession()Notes
Transactions are associated with a client session.
MongoDB Transactions and Change Streams
Use sessions, multi-document transactions, and change streams for modern event-driven and consistency-sensitive MongoDB applications.
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Transactions
Use client sessions and transaction boundaries in mongosh.
javascript
session.startTransaction()Notes
Transactions are available on deployments that support them, such as replica sets.
javascript
const session = db.getMongo().startSession();
const appdb = session.getDatabase("appdb");
session.startTransaction();
try {
appdb.accounts.updateOne({ _id: 1 }, { $inc: { balance: -50 } });
appdb.accounts.updateOne({ _id: 2 }, { $inc: { balance: 50 } });
session.commitTransaction();
} catch (err) {
session.abortTransaction();
throw err;
} finally {
session.endSession();
}Notes
A classic transfer example: either both updates commit or neither does.
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session.abortTransaction()Notes
Useful when an error or validation failure occurs mid-flow.
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session.endSession()Notes
A good habit after session-based work.
Change streams
Listen for inserts, updates, and deletes as they happen.
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const stream = db.orders.watch()Notes
Change streams let applications react to new writes in near real time.
Watch only selected changes
Filter stream events with a pipeline.
javascriptANYmongodbchange-streamspipeline
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const stream = db.orders.watch([{ $match: { operationType: "insert" } }])Notes
Filtering early helps keep change events focused and lighter to process.
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stream.next()Notes
Useful for testing and interactive exploration.
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