MongoDB mongosh Create Database

MongoDB mongosh Create Database

In MongoDB mongosh Create Database are created automatically when you store data in them.
There is no CREATE DATABASE command like in SQL.

1️⃣ Start mongosh

Open Terminal / Command Prompt and run:

You’ll see a prompt like:

2️⃣ Check Existing Databases

 Example output:

3️⃣ Switch to (Create) a New Database

Use the use command:

Output:

Important:
At this stage, the database is NOT actually created yet.

4️⃣ Create Database by Inserting Data

MongoDB creates a database only when data is inserted.

Example: Create a collection and insert a document

Output:

 Now the database is officially created.

5️⃣ Verify Database Creation

Now you’ll see:

6️⃣ Check Current Database

Output:

7️⃣ Create Multiple Collections (Optional)

MongoDB automatically creates:

• products collection

• orders collection

8️⃣ Create Empty Collection (Optional)

If you want a collection without inserting data:

Output:

9️⃣ Delete a Database (Extra – Interview Tip)

 Deletes the current database completely.

Key Points (Very Important for Exams & Interviews)

✔ MongoDB creates databases automatically
✔ use dbName → switches database context
✔ Database appears only after data insertion
✔ Collections are creating automatically
✔ No CREATE DATABASE command in MongoDB

 Common Interview Questions

Q1. Does use myDB create a database?
👉 ❌ No, it only switches context

Q2. When is a database actually creating?
👉 ✅ When the first document is inserting

Q3. Can MongoDB have empty databases?
👉 ❌ No, it must contain data

Summary