This document provides an overview of MongoDB and DynamoDB. It defines NoSQL and describes MongoDB and DynamoDB as document-based and key-value based NoSQL databases respectively. It discusses why to use MongoDB over RDBMS and provides examples of setting up, querying, and replicating MongoDB. It also briefly describes features of DynamoDB like auto-scaling and pricing. Overall, the document serves as an introduction to MongoDB and DynamoDB.

1. MongoDB and DynamoDB
September 8, 2020
Md Minhazul Haque
hello@mdminhazulhaque.io

2. What is NoSQL
● Stands for Not SQL
● No relational form, No schema
● No storing data in tables
● Supports sharding for data partitioning
● Different adaption to NoSQL
○ Document Based: MongoDB, CouchDB
○ Key-value Based: DynamoDB, Redis

3. Why use MongoDB
● Scalable horizontally unlike RDBMS
● Supports dynamic Data Structure
● Caching not needed for performance tuning
● Saves time in designing database
● More agile

4. NoSQL vs RDBMS Terms
MongoDB SQL
Database Database
Collection Table
Index Index
Document Row
Field Column
Link/Embed Join

5. Who uses MongoDB

6. Who uses MongoDB

7. Setting Up MongoDB

8. Setting Up MongoDB
# ubuntu
sudo apt install mongodb-server mongodb-clients
# centos
sudo yum install -y mongodb-org-4.4.0
mongodb-org-server-4.4.0 mongodb-org-shell-4.4.0
mongodb-org-mongos-4.4.0 mongodb-org-tools-4.4.0

9. Starting MongoDB Daemon
mongod
mongod --dbpath /my/custom/path
mongod --port 27017
mongod --bind_ip 127.0.0.1
mongod --config /etc/mongodb.conf
Mongod --replSet prod_replica

10. Accessing MongoDB using Client
mongo
mongo 127.0.0.1
mongo 127.0.0.1:27017
mongo 127.0.0.1:27017/formapply

11. MongoDB: Create Query
> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
> use users
switched to db users
> db.users.insert({name:"Foo Bar"})
WriteResult({ "nInserted" : 1 })

12. MongoDB: Read Query
> use users
> db.users.find({})
{ "_id" : ObjectId("5f5659472eef8cb6bf6a02f1"),
"name" : "Foo Bar" }

13. MongoDB: Update Query
> db.users.update({}, {$set: {name:"Tanvir
JurisTech"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0,
"nModified" : 1 })
> db.users.find({})
{ "_id" : ObjectId("5f5659472eef8cb6bf6a02f1"),
"name" : "Tanvir JurisTech" }

14. MongoDB: Delete Query
> db.users.remove({name:"Tanvir JurisTech"})
WriteResult({ "nRemoved" : 1 })
> db.users.find({})
>

15. MongoDB: Replica Set
mongod --dbpath /data/db1 --port 27001 --replSet
prod
mongod --dbpath /data/db2 --port 27002 --replSet
prod
mongod --dbpath /data/db3 --port 27003 --replSet
prod

16. MongoDB: Replica Set
> rs.initiate( {
_id : "prod",
members: [
{ _id: 0, host: "127.0.0.1:27001" },
{ _id: 1, host: "127.0.0.1:27002" }
]
})
{
"ok" : 1,
"operationTime" : Timestamp(1599495296, 1),
...
}

17. MongoDB: Replica Set
> mongo 127.0.0.1:27001
prod:PRIMARY> use messages
switched to db messages
prod:PRIMARY> db.messages.find({})
prod:PRIMARY> db.messages.insert({message:"Hello World!"})
WriteResult({ "nInserted" : 1 })
> mongo 127.0.0.1:27002
prod:SECONDARY> rs.slaveOk()
prod:SECONDARY> use messages
switched to db messages
prod:SECONDARY> db.messages.find({})
{ "_id" : ObjectId("5f565dcc832cf9e810aeea2d"), "message" :
"Hello World!" }

18. MongoDB: Replica Set
> mongo 127.0.0.1:27001
prod:PRIMARY> rs.add({ _id: 2, host: "127.0.0.1:27003" }
> prod:SECONDARY> rs.conf()
{
"_id" : "prod",
"members" : [
{
"host" : "127.0.0.1:27001",
},
{
"host" : "127.0.0.1:27002",
},
{
"host" : "127.0.0.1:27003",
}
]
}

19. MongoDB: Replica Set
> mongo 127.0.0.1:27001
prod:PRIMARY>
2020-09-08T00:28:05.646+0800 I NETWORK [thread1] trying
reconnect to 127.0.0.1:27001 (127.0.0.1) failed
2020-09-08T00:28:05.646+0800 W NETWORK [thread1] Failed to
connect to 127.0.0.1:27001, in(checking socket for error after
poll), reason: Connection refused
2020-09-08T00:28:05.646+0800 I NETWORK [thread1] reconnect
127.0.0.1:27001 (127.0.0.1) failed failed
# stop mongodb on port 27001
> mongo 127.0.0.1:27002
prod:SECONDARY>
prod:SECONDARY>
prod:PRIMARY>
prod:PRIMARY>
prod:PRIMARY>
prod:PRIMARY>

20. DynamoDB

21. Why use DynamoDB
● Key-value based database at scale
● Serverless (managed by AWS)
● Auto scaling on enterprise level
● Read/Write capacity mode
● Realtime Trigger/Streams
● Priced on Read/Write operation*
● Automatic replication among AZ
● Handy HTTP API

22. Who uses DynamoDB

23. DynamoDB: Create Table

24. DynamoDB: Create Table

25. DynamoDB: Create Table

26. DynamoDB: Insert Item

27. DynamoDB: Insert Item

28. DynamoDB: Update Item

29. DynamoDB: Delete Item

30. Q&A

31. More references
● https://www.mongodb.com/nosql-explained/nosql-vs-sql
● https://www.featuredcustomers.com/vendor/amazon-dynamodb/customers
● https://bits.mdminhazulhaque.io/mongodb/mongodb-for-mysql-people.html
● https://bits.mdminhazulhaque.io/aws/aws-cli-cheatsheet.html#dynamodb
● https://aws.amazon.com/dynamodb/features/
● https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStar
ted.PHP.html