Install a Local Instance of AWS DynamoDB

STEP 1:Press Command+Space and type Terminal and press enter/return key .

STEP 2:Install Brew(If you don't already have it installed.) Run this command in the Terminal app.

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

Wait for the command to finish.

STEP 3:Use Brew to install and download dynamoDB so that you can run it locally.

brew install dynamodb-local

Launch your DynamoDB local instance like this:

To have start dynamodb-local now and restart at login as a background service using brew services:

brew services start dynamodb-local

Or, if you don't want/need a background service you can just run:

/usr/local/bin/dynamodb-local

You can then access a JS Shell in a browser such as Chrome:

URL to hit the javascript shell for your locally running DynamoDB instance:

http://localhost:8000/shell/

This is what you will see what you load up your DynamoDB Shell. If you see this, then you are successfullyrunning a local instance of DynamoDB!

AWS Local DynamoDB Javascript Shell in Browser

Common DynamoDB Concepts

Table: Acollection of data Items: An item is a group of attributes that is uniquely identifiable among all of the other items. Attributes: An attribute is a fundamental data element, something that does not need to be broken down any further. Primary Key Partition Key: Composed of one attribute known as the partition key Partition Key and Sort Key: Composite primary key, composed of two attributes.

Datatypes

Scalar

Number: String Example: "N": "123.45" String: String Example: "S": "Hello" Binary: Base64-encoded binary data Example: "B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk" Boolean: Boolean Example: "BOOL": true Null: Boolean Example: "NULL": true

Multi-value

String Set: Array of Strings Example: "SS": ["Giraffe", "Hippo" ,"Zebra"] Number Set: Array of Strings Example: "NS": ["42.2", "-19", "7.5", "3.14"] Binary Set: Array of Base64-encoded binary data Example: "BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

Document

List: array of AttributeValue objects Example: "L": ["Cookies", "Coffee", 3.14159] Map: String to AttributeValue object map Example: "M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}
Some further reading on DynamoDB https://aws.amazon.com/dynamodb/getting-started/ What is noSQL and how is it implemented on AWS? Amazon DynamoDB: How It Works in the Amazon DynamoDB Developer Guide Sign up for a monthly webinar series: https://aws.amazon.com/about-aws/events/monthlywebinarseries/?trkCampaign=WEBINARSERIES&trk=juneseries16homepage