1. Presented By: Aarushi Chawla (2012002) Shiv Kandikuppa (2012095)
DynamoDB: NoSQL DB
Presented By:
Aarushi Chawla ( )
Shiv Kandikuppa ( )

2. DynamoDB: NoSql Database Service
Consistent and fast performance
Eventually consistent reads
Conditional updates
Horizontally scalable
AWS management console to monitor performance
Eventually consistent reads - The data updated might not be available in the next read request as it takes time for this to propagate across multiple servers
Conditional updates - Dynamo does not give the guarantee of any ACID properties since it has to be fast. However it manages concurrency issues by using the conditional updates.
Horizontally scalable - Table can span across multiple servers unlike a traditional RDBMS where the servers have to be vertically scaled up.

3. DynamoDB Data Model Tables : A collection of items
Item: A collection of attributes {
Id = 201
ProductName = “cyclone”
Description = “201 description”
BicycleType = “Road”
Brand = “FireFox”
Price = 100
Color = [“Red”, “Black”]
Type = “Bike” }
Item 1 {
Id = 205
ProductName = “mercedes-cla”
Brand = “Benz”
Price = 3.5cr
Color = [“Pink”, “Black”, “Golden”]
Type = “Car” }
Item 2

4. DynamoDB Indexes Primary Key Secondary Indexes Partition Key/Hash Key
Sort Key/Range Key
Secondary Indexes
Global
Local
Table Name
Primary Key Type
Partition Key name
Sort Key Name
Forum(Name, ...)
Simple
Name -
Thread(ForumName, Subject...)
Composite
ForumName
Subject
Primary Key-
The partition key is used to calculate the hash which gives the server in which the entry has to be stored.
When both partition key and range key are used as indices, then partition key and range key must always be a unique combination
Global secondary Index-
Similar to the primary key where we need to have a partition key and an optional sort key.
Local secondary Index-
Very similar to our normal search queries. These must however be defined at the time of table creation and cannot be altered later.

5. Src: http://docs. aws. amazon

6. DynamoDB Operations Create/ Update/ Delete Table Src: aws.amazon.com
Dynamo provides a long list of operations. However we will only be discussing a few of them over here.
Src: aws.amazon.com

7. DynamoDB Operations Read Item Write Item Scan Item Query Item
Dynamo provides a long list of operations. However we will only be discussing a few of them over here.

8. Scan & Query
Src: aws.amazon.com

9. References
duction.html
Understanding-Query-and-Scan-operations/