How to Install MongoDB on UBUNTU & How the MongoDB Works?

MongoDB package is available on the UBUNTU repository. So we have to just install it using the command line.

Update the repository to the latest version of MongoDB
sudo apt-get update

Start the MongoDB server
sudo service mongodb start

You can communicate with the MongoDB server using mongo shell.
mongo command will take us to the mongo shell

It will connect to default database test

For creating the database the command is 'use'. In the process of creation of database the mongoDB creates a new database or it will connect to the existing database.

Let's create a database name 'mydb'

Now let's create some collection using,

You can find the collection using,

Query and Write Operation Commands

Name	Description
find	Selects documents in a collection.
insert	Inserts one or more documents.
update	Updates one or more documents.
delete	Deletes one or more documents.
findAndModify	Returns and modifies a single document.
getMore	Returns batches of documents currently pointed to by the cursor.
getLastError	Returns the success status of the last operation.
getPrevError	Returns status document containing all errors since the last resetError command.
resetError	Resets the last error status.
eval	Deprecated. Runs a JavaScript function on the database server.
parallelCollectionScan	Lets applications use multiple parallel cursors when reading documents from a collection.

See the mongo Shell Commands here