Скачать или смотреть How to Resolve the Issue of Your MongoDB Database Not Appearing with the show dbs Command

If you can't see your MongoDB database when using the `show dbs` command, this guide explains why that happens and provides step-by-step solutions to make your database visible.
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This video is based on the question https://stackoverflow.com/q/63709850/ asked by the user 'Afikasky' ( https://stackoverflow.com/u/13491572/ ) and on the answer https://stackoverflow.com/a/63710141/ provided by the user 'varman' ( https://stackoverflow.com/u/7975771/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Issue: Why is My MongoDB Database Not Visible?

Connecting to a MongoDB database is usually straightforward, but encountering issues where your database does not appear when you run the show dbs command can be frustrating. Many new users of MongoDB might find themselves in this situation, which raises the question: “Why is my database, in this case, Cats, not visible?”

When you connect to your MongoDB instance and type show dbs, you might only see the default databases like admin, config, and local without your expected database in sight. This common issue can often be attributed to misunderstandings about how MongoDB handles database creation and visibility.

Key Points to Understand

Database Creation in MongoDB: In MongoDB, databases are not created until they actually contain data. Simply connecting to a database or switching to it with the use command does not create it in the system metadata.

Visibility Requirement: The show dbs command only lists databases that contain at least one document. Thus, even if you've connected to the Cats database, it will remain invisible until it holds some data.

Step-by-Step Solution to Make Your Database Visible

Let's go through the steps you need to take to ensure the Cats database appears in your command line using show dbs:

Step 1: Use the Database

First, you need to switch to the Cats database to ensure you're preparing to work within it.

[[See Video to Reveal this Text or Code Snippet]]

After executing this command, you'll be working within the Cats database context. However, remember that this alone won’t make it visible until you insert some data.

Step 2: Insert a Document

To make your database visible, you need to insert at least one document. Here is a simple example to insert an item:

[[See Video to Reveal this Text or Code Snippet]]

The above command creates a collection named animal within your Cats database and inserts a document with "name": "dogs" into that collection.

Step 3: Verify Database Visibility

Now that you have inserted at least one document, you can check the visibility of your database once again. Type the following command:

[[See Video to Reveal this Text or Code Snippet]]

After running this command, you should now see the Cats database listed along with any other databases you may have.

Conclusion: Making Your Database Work for You

In summary, if your MongoDB database doesn't appear when running the show dbs command, remember that databases in MongoDB are not officially created until they contain at least one document. By switching to the database using use, then inserting a document, you can successfully make your database visible in your command line.

Now you can confidently interact with your Cats database through your MongoDB command line interface!

Feel free to reach out if you encounter any further questions or need support with MongoDB!