You can remove a collection from a specific database by using the drop collection command. Unlike the remove command, this removes all links and indices in the collection as well.
The structure of the NoSQL database management systemMongoDB is very different to relational database solutions like MySQL. In particular, NoSQL systems are set up in a way that allows for more scalability and flexibility. In such a system, data is stored in documents, which are then organized into collections. While MongoDB automatically creates collections, you also have the option as the user to set them up manually in MongoDB with Create Collection. By setting collections up yourself, you can define certain parameters, like the maximum size of a document. If, however, you want to get rid of a collection, you can use drop collection to remove it from the database.
Would you like to learn more commands? Then take a look at our overview at MongoDB commands.
The MongoDB Drop Collection command is simple and always follows the same syntax. Here’s how to write it:
db.COLLECTION_NAME.drop()In order to explain how to correctly use MongoDB Drop Collection, it’s helpful to have an example. Let’s say that we have set up a client list that is organized by country, with each collection in the data bank corresponding to a different country. Now, we need to delete the collection with clients from the United States.
Before you use drop collection, you’ll first want to give yourself an overview of all the collections you have. You can do this by using the show collections command. Here is an example of the syntax for this command:
>use clientlist
switched to db clientlist
>show collections
unitedstates
unitedkingdom
france
italy
>The collection that we need (“unitedstates”) has been located in the database.
Next, carry out the command to remove the collection. Using our example, the command looks like this:
>db.unitedstates.drop()If you have successfully carried out the command, you will see the following:
>db.unitedstates.drop()
true
>If, however, you were not able to successfully remove the collection, the value “false” will appear. This could be the result of a spelling error or perhaps, the collection doesn’t actually exist.
To be certain that the MongoDB Drop Collection command was successfully carried out, it’s important to go back and check all the collections in your selected database. You can do this by repeating the show collections command.
>show collections
unitedkingdom
france
italy
>In addition to the MongoDB Drop Collection command, there is also the remove command. Despite having similar syntax, this method only removes a document within the collection, leaving the indices you created using MongoDB Create Index intact. If you want to remove the collection as well as all of its links, make sure to use the MongoDB Drop Collection command.
The MongoDB Database Management System is easy to work with once you know MongoDB commands. In this article, we list the most important commands and outline what the individual functions can do. So look no further, because this guide will help you find the MongoDB command you need.
The Database Management System does not recognize the MongoDB Create Database command, but you can still manage to create databases with it. The software will automatically create a new database if the keyword “use” is entered. Our useful guide will outline exactly how this works and how it could be of use to you.
Like most databases, MongoDB relies on indexes. The MongoDB Create Index command allows you to create indexes manually. We’ll explain how this method works with an example, and we’ll explain what it is suitable for and its advantages. We’ll also show you how to delete indexes with MongoDB Drop Index. Read on to find out more.
You can use MongoDB with several other users and maintain databases together. Use MongoDB Create User to give other people access to a database. We’ll explain what this command does, the commands and their parameters and how to assign roles. We’ll also look into how to delete a user and what to remember before doing so.
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