Introduction to MongoDB.pptx

Introduction to
MongoDB
Surya Prakash
Gupta

Agenda
Presentation Title
Introduction to MongoDB 2
 What is NoSQL?
 Types of NoSQL
 SQL Vs NoSQL
 When to use NoSQL?
 What is MongoDB?
 Features of MongoDB
 MongoDB Data types
 Who’s using MongoDB?
 MongoDB terms
 MongoDB Installation
 Some MongoDB commands
 MongoDB Compass & MongoDB
Atlas
 References

What is NoSQL Database?
 The term “NoSQL database” refer to any “Non-relational” or “Not only SQL” databases
provides a mechanism for storage and retrieval of data in a format other than tabular relations
model used in relational databases.
 NoSQL database doesn't use tables for storing data.
 It is generally used to store big data and real-time web applications.
 Flexible schema i.e., no predefined or rigid schema.
 It avoids joins and is easy to scale.

Types of NoSQL Database
NoSQL Databases are mainly categorized into four types: Key-value pair, Column-oriented,
Graph-based & Document-oriented.

SQL Vs NoSQL
SQL NoSQL
SQL databases are primarily called
RDBMS or Relational Databases.
NoSQL databases are primarily called
as Non-relational or distributed
database.
SQL databases are table-based
databases.
NoSQL databases can be document
based, key-value pairs, graph
databases.
Vertical Scalability Horizontal Scalability
Fixed or Predefined schema. Flexible schema.
Not suitable for hierarchical data storage. Suitable for hierarchical data storage.
Oracle, MySQL, Microsoft SQL Server,
and PostgreSQL.
Document: MongoDB and CouchDB,
Key-value: Redis and DynamoDB,
Column-based: Cassandra and HBase,
Graph: Neo4j and Amazon Neptune.

When to use NoSQL?
1. When a huge amount of data needs to be stored and retrieved.
2. The relationship between the data you store is not that important
3. The data changes over time and is not structured.
4. Constraints and Joins support is not required at database level.
5. The data is growing continuously, and you need to scale the database regularly to handle
the data.

What is MongoDB?
 Most popular NoSQL database.
 Open-source document-oriented database.
 Its scale-out architecture allows you to meet the
increasing demand for your system by adding
more nodes to share the load.
 MongoDB uses BSON (Binary JSON) to query
database.
 Stores data in the form of BSON documents.

Features of MongoDB
 Indexing: Efficient search & data processing in very less time.
 Scalability: MongoDB scales horizontally using sharding (partitioning data across various
servers). Also, new machines can be added to a running database.
 Replication & High Availability: Multiple copies of data is replicated on different servers
which protects the database from hardware failures. If one server goes down, the data can
be retrieved easily from other active servers which also had the data stored on them.
 Load balancing: It has an automatic load balancing configuration because of data placed in
shards.
 Aggregation: Aggregation operations process data records and return the computed
results. It is like the GROUPBY clause in SQL. A few aggregation expressions are sum, avg,
min, max, etc.
 Languages supported: The list of supported languages includes Node.js, C, C++,
C#, Go, Java, Perl, PHP, Python, Ruby, Rust, Scala, and Swift.

MongoDB Data Types

Who’s is using MongoDB?
MongoDB has been adopted as backend software by a few major websites and services
including Toyota, Cisco, Shutterfly, Adobe, Ericsson, Craigslist, eBay, and Foursquare.

MongoDB Terms
 Databases: A database stores one or more collections of documents.
 Collections: MongoDB stores documents in collections. Collections are analogous to tables
in relational databases.
 Documents: MongoDB stores data records as BSON documents & similar to JSON
objects. It is analogous to row in relational databases. These are composed of field-and-value
pairs and have the following structure:
{
field1: value1,
field2: value2,
field3: value3,
...
fieldN: valueN
}
 Fields Names: These are strings analogous to column in relational databases.

Example

SQL Vs MongoDB Terms

MongoDB Installation
 MongoDB is available in two server editions: Community and Enterprise.
 Community edition is free & Enterprise edition is a paid version and has some advanced
features.
 Installation links:
Install MongoDB — MongoDB Manual
Community: Try MongoDB Community Edition | MongoDB
Enterprise: Try MongoDB Enterprise Advanced | MongoDB

Create Database
The use Database_name command makes a new database in the system if it does not exist, if
the database exists it uses that database.
For example, use mydb.
Now your database is ready of name mydb.

List all databases
To list down all the databases, use the command below:
show dbs
This command lists down all the databases and their size on the disk.
mydb database is not created until you save a document in it.

Create Collection
To create collection, use the command below:
db.createCollection(name, options)
name is name of collection to be created. Options is a document and is used to specify
configuration of collection such as capped, autoIndexId, size.

List all Collections
To see all collections in a database, use the command below:
show collections

Drop Database & Collection
 Use the following command to delete a database:
db.dropDatabase()
 Use the following command to delete a collection:
db.collection_name.drop()

Create Documents
Two methods insert or create documents in collection:
1. db.collection_name.insertOne()
2. db.collection_name.insertMany()

Retrieving Documents
 Use the below command to retrieve documents:
db.collection_name.find()
 For a proper formatted output, use the below command: pretty() with find().
db.collection_name.find().pretty()

Retrieving Documents

Retrieving Documents with Filters or
Criteria

Update Documents
 There are 2 ways to update documents:
1. db.collection_name.updateOne()
2. db.collection_name.updateMany()

Update Documents

Delete Documents
 There are 2 ways to delete documents:
1. db.collection_name.deleteOne()
2. db.collection_name.deleteMany()

MongoDB Compass & MongoDB Atlas
 MongoDB Compass is a powerful GUI for querying, aggregating, and analyzing your
MongoDB data in a visual environment. It is free to use and can be run on macOS,
Windows, and Linux.
 Installation link: MongoDB Compass Download | MongoDB
 MongoDB Atlas is a multi-cloud database service by the same people that build MongoDB.
It makes easy to deploy and manage databases on-demand when and where you need
them.
 Get Started with Atlas — MongoDB Atlas

References
 MongoDB Documentation
 MongoDB - OneCompiler - Write, run and share MongoDB code online
 Online mongoDB Terminal - practice mongoDB online (jdoodle.com)
 MongoDB Exercises, Practice, Solution - w3resource

Introduction to MongoDB.pptx

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