Complete MongoDB Notes:

Introduction:

What is Mongodb:

• MongoDB is an Open-Sourse, Document-Oriented No-Sql Database Management System.
• Mongodb
• Casendra, MySql, MongoDb, Oracle.
• A Database that Stores Information in a Document.
• In the Form of .JSON Format.
• Designed for Flexibility, Scalability, and Performance in Handling Unstructure or Semi-Structure Data.

More About Mongodb:

• MongoDb Software -> 10gen -> MongoDb
• It was Created by a company 10gen whisvh is now known as Mongodb, Inc. The company was founded by Eliot Horowitz and Dwight Merriman in 2007. the first version of mongodb was release in 2009.
• Humongous - Mongos

SQl	NoSQl
SQL Database are Relational Databases.	NoSql Databsae are Non-Relational Databases.
They use Structured tables to Store data in rows and columns.	Theey Provide Flexibility in data Storage, allowing varied data types and Structure.
Sutable for applications with well defined schemas and fixed data structures.	Ideal For Applications with Dynamic or evolving Data Models.
E-Commarce Platform, Hr Management etc.	Content Management System (CMS), Social Media Platforms, Gaming etc.
Examples: MySql, PostgreSQL, Oracle.	Examples: MongoDb, CAssendra, Redies

• SQl: Ingormation, Rows, Columns, Tables, Databases, Fix ROws & Columns - .sql
• NoSQl: Collection: Students, 2-Documents, Embbeded Documents, Flexible - .json
• Inside One Collections, We can have Multiple Documents.

Mongodb Teminologies:

• Database - Multiple Collections - Multiple Documents (Schemaless)

Key Features of Mongodb:

• Flexible Schemaless Design:
  • Mongodb allows dynamic, Schemaless data Structures.
  • Easily Accommodate Changing data requirements.
• Scalability and Performance:
  • Horizontal Scaling Supports large Datasets and High traffic.
  • Optimize read and Write Operations for fast Performance.
  • Document Oriented Storage
• Dynamic Queries:
  • Rich query language with support for complex queries.
  • utilize index to speedup queryexecution.
• Aggregation Framework (Inbult Functions):
  • Perform advanced data transformations and analysis.(avg() - E-Commarce 5-Star Rating Review System)
  • Process data using multiple pipeline stages.
• Open Source and Community: (Copy and Create your Own Database, Expert Suggest Changes)
  • Mongodb is Open Source with a Vibrant Community.
  • Regular Updates, Improvements, and Support.

How Mongodb Works:

• Frontend: Html, CSS, JS, React.js, Next.Js.
• Backend: Node.js, Express.js, Next.js, Python.
• Database: Mongodb Server, Storage Engine (WiredTiger or MMAPV1-❌), Read & Write Data Files operations on Database

JSON VS BSON:

• json-> .json Format, Easy to READ & WRITE | bson-> .byte Binary Format, Not Easy to Read & Write.
• In MongoDb, We Write in Json Format only but behind the scenes data is Stored in BSON (Binary JSON) Format, A Binary representation of JSON.
• By Utilizing Bson, Mongodb can achive Higher read and Write Speeds, reduced Storage Requirements, and improved data manipulation capabibilities making it well-suited for handling large and complex datasets while maintaining performance effeciency.

Installing Mongodb:

• MongodB Community & Server
• MongodB Shell & Playground
• MongodB Database Tools

MAnaging Database In Mongodb:

• Creating | Deleting Databases
• Creating | Deleting Collections
• You Won't see a database listed in the output of the show dbs command, until that database contain at least one collection with data in it.

Managing Databases & Collections:

show dbs;
use <database_name>;
db.dropDatabase();

show Collections;
db.createCollection("<collection_name>");
db.<collection_name>.drop();

MongoDb Databases & Collections Commands:

show dbs;
admin      40.00 KiB
config     72.00 KiB
local     112.00 KiB
testapp1   96.00 KiB

show databases;
admin      40.00 KiB
config     72.00 KiB
local     112.00 KiB
testapp1   96.00 KiB

use students;
switched to db students

show collections;

db.createCollection("data");
{ ok: 1 }

show collections;
data

show databases;
admin      40.00 KiB
config    108.00 KiB
local     112.00 KiB
students    8.00 KiB
testapp1   96.00 KiB

db.data.drop();
true

show collections;

db.dropDatabase();
{ ok: 1, dropped: 'students' }

show databases;
admin      40.00 KiB
config    108.00 KiB
local     112.00 KiB
testapp1   96.00 KiB

• Delete node_modules Before Uploding on github.
• Download Project in your pc:
  • Intialise node_modules in your project by using npm install command:
  • This will install mongoose in your dependancies in package.json:
• Download and Install MongoDb and It Will Automatically Start Your Server:
  1. MongodB Community & Server
  2. MongodB Shell & Playground
  3. MongodB Database Tools