Databases - DynamoDB

Question 1

What is DynamoDB

Answer 1

fast and flexible NoSQL database service for all apps that need consistent, single-digit millisecond latency at any scale.

Question 2

Is DynamoDB fully managed?

Answer 2

Yes

Question 3

What models does DynamoDB support?

Answer 3

Document, key-value

Question 4

Uses for DynamoDB

Answer 4

mobile, web, gaming, ad-tech, IoT

Question 5

Where is data in DynamoDB stored?

Answer 5

SSD Storage

Question 6

Where is DynamoDB spread?

Answer 6

across 3 geographically distinct data centers (not AZs)

Question 7

Default consistency model for DynamoDB

Answer 7

Eventual Consistent Reads. Strongly consistent reads is the other

Question 8

Eventual Consistent Reads

Answer 8

Consistency across all copies of data is usually reached within 1 second. repeating a read after a short time should return the updated data (best read performance)

Question 9

Strongly Consistent Reads

Answer 9

returns the result that reflects all writes that received a successful response prior to the read

Question 10

If low latency is important

Answer 10

pick Eventual consistent reads. Otherwise, pick strongly consistent reads

Question 11

DynamoDB pricing

Answer 11

Provisioned throughput capacity, storage

Question 12

How expensive is DynamoDB?

Answer 12

Expensive for writes, cheap for reads

Question 13

Use case for DynamoDB

Answer 13

If DB is read-heavy, scalabilty and good performance are important, SQL is not necessary

Question 14

default read and write capacity units when creating a DynamoDB table

Answer 14

5, 5

Question 15

can you purchase reserved capacity?

Answer 15

Yes, 1 or 3-year terms

Question 16

Item

Answer 16

Row

Question 17

Important metrics to know

Answer 17

Read capacity Units, Write capacity units (both provisioned/consumed)