Database / MongoDB Interview questions
What does <mongo_db_collection>.watch() command do?
watch function opens a change stream cursor on the collection.
Change streams allow applications to access real-time data changes without any complexity. Applications can use change streams to subscribe to all data changes on a single collection, a database, or an entire deployment, and immediately react to them.
const collection = db.collection('employee'); const changeStream = collection.watch(); changeStream.on('change', next => { // process next document });
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