Introduction to MongoDB

Summary:👉 TABLE OF CONTENTS:

• Chapter 01: What is MongoDB?
• Chapter 02: Functionality of MongoDB
• Chapter 03: Why use MongoDB?
• Chapter 04: Comparing Terminologies
• Chapter 05: CRUD Terms
• Chapter 06: Advantages of MongoDB

MongoDB ✅

• MongoDB is a scalable, high-performance, open-source, schema-free, document-oriented database.
• Used NoSQL mechanism.
• MongoDB also provides the feature of Auto-Scaling. Since, MongoDB is a cross-platform database and can be installed across different platforms like Windows, Linux, etc.
• Supports APIs in many computer languages like JavaScript, Python, Ruby, Perl, Java, C#.
• Record in MongoDB is a document.

Functionality of MongoDB ✅

• Document-based database.
• Secondary indexes.
• Atomic writes and fully-consistent reads.
• Query language via an API.
• Dynamic schema (no DDL).
• Master-Slave replication.
• Supports map-reduce and aggregation tools.
• Easy to administer in the case of failures.
• automatic load balancing.
• Stores files of any size easily without complicating your stack.

Why use MongoDB? ✅

• Easy and fast integration of data. (no ERD diagram).
• Simple queries.
• The functionality provided applicable to most web applications.
• Document Oriented Storage.
• Index on any attribute.
• Auto-sharding.

Comparing Terminologies ✅

SQL Terminologies	MongoDB Terminologies
Database	Database
Table	Collection
Row	Document
Column	Field
Index	Index

CRUD Terms ✅

SQL Operation	MongoDB Operation
Create	Create
Insert	Read
Update	Update
Delete	Remove

• Create ✔
• db.collection.insert( <document> )
• db.collection.save( <document> )
• db.collection.update( <query>, <update>, { upsert: true } )

• Read ✔
• db.collection.find( <query>, <projection> )
• db.collection.findOne( <query>, <projection> )

• Update ✔
• db.collection.update( <query>, <update>, <options> )

• Delete ✔
• db.collection.remove( <query>, <justOne> )

Advantages of MongoDB over RDBMS (Relational Database Management System) ✅

• No complex joins.
• The structure of a single object is clear.
• MongoDB provides the facility of the deep query.
• Ease of scale-out.
• MongoDB is schema-less: is a document database in which one collection holds different documents.
• uses internal memory for storing working sets.

References:

        www.tutorialspoint.com/mongodb

        https://docs.mongodb.com