MongoDB: A NOSQL document based database

Introduction

Laymen explanation

Do you know, India’s Unique Identification project, aka Aadhar, is the world’s biggest biometrics database. Aadhar is in the process of capturing demographic and biometric data of over 1.2 billion residents. Aadhar has used MongoDB as one of its databases to store this huge amount of data.

Technical explanation

MongoDB is a cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL).

The motivation of the MongoDB language is to implement a data store that provides high performance, high availability, and automatic scaling.

Characteristics

• Object-oriented

  • Document oriented

  • High performance

  • High availability — Replication

  • High scalability – Sharding

  • Dynamic — No rigid schema.

  • Flexible – field addition/deletion have less or no impact on the application

  • Heterogeneous Data

  • No Joins

  • Distributed

  • Data Representation in JSON or BSON

  • Geospatial support

  • Easy Integration with BigData Hadoop

  • Document-based query language that’s nearly as powerful as SQL

  • Cloud distributions such as AWS, Microsoft, RedHat,dotCloud and SoftLayer etc:-. In fact, MongoDB is built for the cloud. Its native scale-out architecture, enabled by ‘sharding,’ aligns well with the horizontal scaling and agility afforded by cloud computing.

Uses

• MongoDB can be used as a file system, called GridFS, with load balancing and data replication features over multiple machines for storing files

MongoDB docker

https://hub.docker.com/_/mongo

Troubleshooting

Shell based

using shell commands

$ docker exec -it buildozer_ub_mongo bash

root@ec68953035ba:/#

root@ec68953035ba:/#

root@ec68953035ba:/# ps ax

PID TTY STAT TIME COMMAND

1 pts/0 Ss+ 0:00 /usr/sbin/sshd -D

16 ? Sl 6:59 mongod --dbpath /srv/mongodb/

189 pts/3 Ss 0:00 bash

206 pts/3 Sl+ 0:00 mongo

214 ? Ss 0:00 sshd: root@pts/1

228 pts/1 Ss 0:00 -bash

247 pts/1 Sl+ 0:00 mongo

252 ? Ss 0:00 sshd: root@pts/4

266 pts/4 Ss+ 0:00 -bash

276 pts/2 Ss 0:00 bash

285 pts/2 R+ 0:00 ps ax

root@ec68953035ba:/# mongo

MongoDB shell version: 2.6.10

connecting to: test

> show dbs

4beb68nau0-meow 0.078GB

8dbymvm6ze-meow 0.078GB

hdfmxutpcb-meow 0.078GB

m7i8b8u4mm-meow 0.078GB

p0hfq6voo0-meow 0.078GB

p2qn8s55dr-meow 0.078GB

s7sb117doy-meow 0.078GB

sfvomq3vg4-meow 0.078GB

test (empty)

test_database 0.078GB

uxl9g8vcel-meow 0.078GB

yhnse9cjyi-meow 0.078GB

> use test_database

switched to db test_database

> show collections

posts

system.indexes

> use test

switched to db test

> show collections

>

Ref: https://docs.mongodb.com/manual/reference/mongo-shell/

Mongo express web interface based

Below example shows

1. There is a DB with name test_database

2. This DB has collection with name posts

3. This collection has two documents

Ref: https://hub.docker.com/_/mongo-express

TLS setup

TLS certificate generation

Ref: https://medium.com/@rajanmaharjan/secure-your-mongodb-connections-ssl-tls-92e2addb3c89

For enabling TLS

Refer https://github.com/krdpk17/mongodb-ssl-docker

Mongodb real life use-case

https://www.edureka.co/blog/real-world-use-cases-of-mongodb/

FAQs

Mongo example config

https://stackoverflow.com/questions/37063662/docker-mongodb-config-file

Mongo DB connect with SSL

https://api.mongodb.com/python/current/examples/tls.html

Security Checklist

https://docs.mongodb.com/manual/administration/security-checklist/

https://docs.mongodb.com/manual/security/

Reference

https://en.wikipedia.org/wiki/MongoDB

https://dzone.com/articles/why-mongodb