How to create a db in MongoDB?
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How to Create a Database in MongoDB
Creating a database in MongoDB is straightforward and does not require explicit commands like traditional relational databases. Here’s how you can create a database:
1. Switch to the Database
- MongoDB does not create a database until you insert data into it.
- Use the
use
command to switch to or create a new database.
Example:
use myDatabase
If myDatabase
does not exist, MongoDB will prepare to create it once you add data.
2. Insert Data into the Database
- MongoDB creates the database only when a collection is created, and documents are added.
Example:
db.myCollection.insertOne({ name: "Alice", age: 25 });
This command:
- Creates the collection
myCollection
inmyDatabase
. - Adds a document to
myCollection
. - Automatically creates
myDatabase
.
3. Verify the Database Creation
- List all databases to confirm creation using the
show dbs
command. - Note: A newly created database will not appear in the list until it contains data.
Example:
show dbs
4. Optional: Create a Collection Explicitly
You can also create a collection explicitly before inserting data.
db.createCollection("myCollection");
Notes
- MongoDB databases are lightweight and only occupy space once data is added.
- MongoDB does not require schema definitions, making it highly flexible for development.
Recommended Resources
For more in-depth knowledge:
- Relational Database Design and Modeling for Software Engineers: Learn database creation and design principles. Check it out
- Grokking SQL for Tech Interviews: Transition from SQL to MongoDB concepts smoothly. Explore here
This approach makes database creation in MongoDB simple and intuitive for modern development needs.
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