MongoDB Create Database

In this post, we will see how to create a database in MongoDB.

The use Command

MongoDB use DATABASE_NAME is used to create a database. The command will create a new database if it doesn't exist, otherwise, it will return the existing database.

Syntax

The basic syntax of use DATABASE statement is as follows −

use DATABASE_NAME

Example

If you want to use a database with name, then use DATABASE statement would be as follows −

> use mydb
switched to db mydb

To check your currently selected database, use the command db:

> db
mydb

If you want to check your database list, use the command show dbs.

> show dbs
local     0.78125GB
test      0.23012GB

Your created database (mydb) is not present in a list. To display a database, you need to insert at least one document into it.

> db.posts.insertOne({
  "id": 1,
  "title": "MongoDB Overview",
  "description": "Post about MongoDB Overview",
  "content": "HTML content here",
  "tags": [
   "Java",
   "MongoDB"
  ]
 })

Let's check just inserted document into a collection with the following command:

> db.posts.find();
{ "_id" : ObjectId("5e175a59bb7bb02737b82435"), "id" : 1, 
"title" : "MongoDB Overview", "description" : "Post about MongoDB Overview", 
"content" : "HTML content here", "tags" : [ "Java", "MongoDB" ] }

Let's check all the databases:

> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
mydb    0.000GB
users   0.000GB

In MongoDB default database is test. If you didn't create any database, then collections will be stored in a test database.

Summary

Below diagram summarizes all the commands used in this post: