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Even though I already showed it in the first course module, it's really important that you understand

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how databases collections and documents are related. In a mongodb world,

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you have one or more databases on your database server and each database can hold one or more collections,

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a collection would be a table in a SQL database.

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Now in that collection, you have these documents, multiple documents per collection and the documents

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are really the data pieces

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you're storing in your database. Now important, when working with mongodb, you will see in this module

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already that the databases, the collections and the documents are all automatically created for you,

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they are created implicitly when you start working with them,

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when you start storing data. That is really convenient, later in the course we'll also learn a way of explicitly

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creating new collections which allows you to configure them a bit further

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but this is a cool feature which makes getting started super simple.

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Now this is the core concept you always should keep in mind and the relation between databases collections

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and documents you always should keep in mind.

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And now with that out of the way, let's actually bring up that Mongo server again, connect through it through

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our shell and again see how we can store data in there

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and which kind of data that is.

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I'm back in the terminal and I now again want to start my mongodb server, here on Mac, I'll do this with

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sudo mongod

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and make sure you watch the installation videos in the first course module to get this up and running

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on Windows or Mac OS or Linux.

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So with that command, I'm prompted to enter my password

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and with this entered, it will start up my mongodb server using the wired tiger storage engine.

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Now this is the server up and running and you need to keep this process running, so don't close this

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window, don't quit this process yet, as you can see it's now waiting for new connections on port 27017

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.

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By the way if you wanted to use a different port or you're facing issues with this one, you can use a

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different port

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and now I did quit the server by hitting control and c, you can use a different port by specifying

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--port when starting up the server

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and then you can for example choose 27018

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as a port

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and now you see, it would be listening on that.

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So that's just a tiny piece of information which can be useful in case you're using that default port

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for something else.

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So with that up and running, let's keep that up and running and open a new additional window in the terminal

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and in there, you can now run Mongo without a d at the end

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to use the mongo shell and automatically connect to the up and running server.

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Now here however, I get a connect failed and that happened because by default, it tries to reach the server

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on port 27017 which is obviously not the port

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I'm running on.

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So I can connect by using Mongo --port and then using that port where my server is running

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and now you see this did connect successfully. With that we did connect again,

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Now you can run cls in here and hit enter to clear the window,

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I'm still in the shell here and if I scroll up, I see all the old output, cls just clears the window.

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And now we can start running commands again and work with our database.