Mongodb - Difference between running “mongo” and “mongod” databases

Question

So, I\'m sure I\'m missing something simple here, but when I run mongo as a daemon (using mongod --fork or just mongod), I see different database content than if I just run

Answer 1

MongoD(Daemon process). In simple "Hello world" words - You won't communicate Mongod directly. Instead, you use DB client:

• Mongo Shell (run mongo) - In an interactive JavaScript interface (-or- run mongosh the new MongoDB Shell).
• Compass - Graphical view of MongoDB (Or studio 3t and other GUI apps).
• Drivers (Like node -or- JAVA drivers).

And you find more tools like this.

In your case, you want to use Mongo Shell client (mongo command).

Visual

A great way to see "the client" - "in action" is to open two terminals (or more) side by side.

Run mongod (mongo command will not work without MongoDB server install and running), then run mongo:

Output (1 connection: application mongo shell}

Next, run some CRUD Operations and see the messages under mongod.

Same idea if you connect Compass client:

Manage mongodb processes docs (Change data directory, Port and so on): https://docs.mongodb.com/manual/tutorial/manage-mongodb-processes/