In earlier versions of MongoDB, you could use the db.collection.copyTo() method to copy a collection.
MongoDB has since deprecated that method. Also, starting in version 4.2, MongoDB has removed the eval command. Given db.collection.copyTo() wraps eval, this means that you can’t use either of them if you’re using MongoDB 4.2 or later.
Fortunately, there’s another way to copy a MongoDB collection.
Continue readingIf you’ve backed up a database using the mongodump utility, you can restore it using the mongorestore utility.
The mongorestore utility loads data from either a binary database dump created by mongodump or the standard input into a mongod or mongos instance.
There are several ways to back up a database in MongoDB. One quick way to back up a database is to use the mongodump tool.
mongodump reads data from a MongoDB database and creates high fidelity BSON files which the mongorestore utitlity can use to restore a MongoDB database.
With mongodump, you can back up a collection, a database, or all databases.
If you no longer need a collection in MongoDB, you can delete it.
Actually, the term for deleting a collection is to drop the collection.
Either way, here are two ways to delete/drop a collection when using the mongo shell.
Continue readingWhen using MongoDB, there’s more than one way to list the collections in a database.
Here are four ways to get a list of collections in a MongoDB database:
show collections CommandlistCollections Commanddb.getCollectionNames() Methoddb.getCollectionInfos() MethodMany update operations in MongoDB have the potential to be upserts. An upsert is a combination of an insert and an update.
It works like this: You perform an update operation based on filter criteria, and if there are any matches, only the matched documents are updated, but if there are no matches, then a new document is inserted.
Continue readingWhen you create a database in MongoDB, your database is basically an empty container for which you can add one or more collections to.
A collection is analogous to a table in relational databases.
In relational databases, you can use CREATE TABLE to create each table that you want in the database.
But MongoDB is not a relational database, and it stores its data as documents. Each document is stored in a collection.
This article shows you how to create a collection in MongoDB.
Continue readingMongoDB doesn’t have a CREATE DATABASE statement like SQL does.
In MongoDB, you create a database simply by switching to a non-existent database, then inserting data.
Continue readingMongoDB is a general purpose, document-based, distributed data platform built for modern application developers and for the cloud.
MongoDB is classified as a NoSQL database. It uses JSON-like documents with optional schemas.
You can use MongoDB as a cloud deployment, or as an on-premise installation.
In this tutorial, I install it as an on-premise installation using the MongoDB Community Edition on Windows.
Continue readingMongoDB is a general purpose, document-based, distributed data platform built for modern application developers and for the cloud.
MongoDB is classified as a NoSQL database. It uses JSON-like documents with optional schemas.
This tutorial shows you how to install MongoDB on a Mac via Homebrew.
Continue reading