How to create database in MongoDB?

How to create database in MongoDB ?

MongoDB do not provide command to create new database directly. Do not need to create Mongo database manually. It is created when you save the documents into the defined collection and database.

The MongoDB contains “db.createCollection()” and is use to create collection manually but not the new database.

I’m going to share the following steps to create collections and database.

Show all Databases Command

When the below show query executed that it return two databases, one is “admin” and other is “local”.

> show dbs
admin   0.03125GB
local   (empty)

Define a database name Command

> use my_new_db
switched to db my_new_db
> show dbs
admin   0.03125GB
local   (empty)

When the above queries executed, the database “my_new_db” is not created yet.

Save Command

In the last, define a collection named “customers” and save a dummy document inside the customer’s collection. The results look like below.

> db.customers.save( {name:"Anil"} )
> db.customers.find()
{ "_id" : ObjectId("1dhac6bfae67067io87ft3"), "name" : "Anil" }

> show dbs
admin   0.03125GB
local   (empty)
my_new_db        0.03125GB

In the Mongodb, when this “save” operation is performed that create the “customers” collection and “my_new_db” database automatically!


For more detail, go to links.


ANIL SINGH

Hey! I'm Anil Singh. I author this blog. I'm Active Blogger, Programmer. I love learning new technologies, programming, blogging and participating the forum discussions more...
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