83 lines
2.5 KiB
Markdown
83 lines
2.5 KiB
Markdown
---
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title: MongoDB
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---
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<img src="https://upload.wikimedia.org/wikipedia/en/thumb/4/45/MongoDB-Logo.svg/527px-MongoDB-Logo.svg.png">
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## MongoDB
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MongoDB is an open-source non-relational database that uses a JSON-like structure to store data.
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It uses a document model to store and retrieve the data instead of the table model used by relational databases such as SQL or Oracle.
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MongoDB is a distributed database at its core, so high availability, horizontal scaling, and geographic distribution are built in and easy to use.
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MongoDB in applications built with javascript is mainly used with Mongoose which is a package built on top of native mongo driver . It gives features like schema based design , virtuals , data validations etc. It makes the mongodb experience smooth and easy to use. You can learn more about mongoose [here](https://mongoosejs.com/).
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### NoSQL Vs RDBMS
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| MongoDB Terms And Concepts | SQL Terms and Concepts |
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| --- | --- |
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| Database | Database |
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| Collection | Table |
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| Document | Row |
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| Field | Column |
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| Index | Index |
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| Embedded Documents | Table Joins |
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### MongoDB Characteristics
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1. Next Generation Database
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2. No Joins
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3. Clustering
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4. Opensource
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5. Schema-Less
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6. No Relationships
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### Features of MongoDB
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1. Document Database
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2. High Performance
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3. Rich Query Language
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4. High Availability
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5. Horizontal Scalability
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6. Supports Indexing
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### Cons of MongoDB
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1. Schemaless design requires database manager to ensure certain constraints
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2. Indexing on multiple fields takes more memory
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3. Aggregation queries are at times non-intutive
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### Sample Document Structure
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{
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"_id":ObjectId("52ffc33cd85242f436123532"),
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"name": "Rich Rick",
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"contact": "8826078979",
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"dob": "11-04-1997",
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"address": [
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{
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"building": "24 A, Indiana Apt",
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"pincode": 123456,
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"city": "Los Angeles",
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"state": "California"
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},
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{
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"building": "170 A, Acropolis Apt",
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"pincode": 456899,
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"city": "Chicago",
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"state": "Illinois"
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}
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]
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}
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### More Information
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[What is Mongo DB?](https://www.mongodb.com/what-is-mongodb)
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[Wikipedia article on Document-oriented Databases](https://en.wikipedia.org/wiki/Document-oriented_database)
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[SQL vs NoSQL](https://insights.dice.com/2012/07/16/sql-vs-nosql-which-is-better/)
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[Learn MongoDB from MongoDB](https://university.mongodb.com/)
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[ACID vs BASE databases](http://www.dataversity.net/acid-vs-base-the-shifting-ph-of-database-transaction-processing/)
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[Getting Started with MongoDB](https://docs.mongodb.com/manual/tutorial/getting-started/)
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