- Published on
MongoDB Tutorial 2025
- Authors
- Name
- Ganesh Negi
What is MongoDB ?
MongoDB is a database server where we can create a huge database.
Mongo means huge means it can store a lot of data efficienlty.
MySQL have schema whereas in mongodb it is a schemaless
MySQL have database -> Table -> rows whereas in Mongodb it has Database -> Collection -> Documents
Documents basically save in JSON format
Here, it is a employee collection have data saved as a documents
{
"name" : "Ganesh",
"age": 32,
"city": "Noida",
"identity" : {
"aadhar" : 873897398478954,
"pan": "PODJD8797K"
}
}
identity is a another docuement hence, we can save nested documents here.
Another example, here another new data has been added according to employee experience , as in above example where employee is fresher
that's why it is schemaless
{
"name" : "Bhavesh",
"age": 40,
"city": "Delhi",
"identity" : {
"aadhar" : 873897398478954,
"pan": "PODJD8797K"
},
"previous: : {
"N2R Tech",
"IUS Tech"
}
}
due to schemaless feature its increase flexibility, scalability .
Summary:-
- mongodb is less relations.
- data is stored together.
What is BSON ?
"Binary JSON"
BSON's binary structure encodes type and length information, which allows it to be traversed much more quickly compared to JSON.
How to create database in MongoDB ?
- go to mongo shell
- use tutorial_mongodb (It will create database if not exists)
- db.students.insertOne({name: "Ganesh", age: 12}) (this command is for insert data into students collections)
- db.students.find() (this will show all data in students collection)
here, _id is a unique identifier for each document in a students collection.
vijyle.