mongo copy from one collection to another (on the same db)

Question

I have got mongo db called test and in this db two collections collection1 and collection1_backup. How to replace content of col

Answer 1

You can use a simple command to Backup MongoDB Collection. It will work only on MongoDB 4.0 or earlier versions.

db.sourceCollectionName.copyTo('targetCollectionName')

Your targetCollectionName must be in Single(') or Double(") Quote

Note:

The db.collection.copyTo() method uses the eval command internally. As a result, the db.collection.copyTo() operation takes a global lock that blocks all other read and write operations until the db.collection.copyTo() completes.