DynamoDB introduction

Last reviewed Jun 1, 2026 Content v20260601

Track mode

none

Means

Read / quiz

Reading

~2 min

Level

beginner

This lesson

An orientation to the AWS track—cloud basics, IAM, core services, and how to practice safely in your own sandbox account.

You need a mental map of regions, IAM, and core services before touching production accounts or cloud interviews.

You will apply DynamoDB introduction in contexts like: Transactional apps, serverless data, and managed database ops.

Read the lesson, reproduce steps in your AWS Free Tier or sandbox (console and optional AWS CLI), diagram the architecture in notes, and complete MCQs—no in-browser cloud lab. Also read the interview prep blocks; enable MFA and avoid using root for daily work.

After you can deploy a simple web app locally—when you will own infrastructure, study for Solutions Architect, or join a team on AWS.

Amazon DynamoDB is a managed NoSQL key-value and document store with single-digit millisecond latency at scale. You define tables with a partition key and optional sort key.

Core concepts

Partition key — distributes data across partitions
Sort key — optional; enables range queries on same partition
On-demand vs provisioned — pay per request vs reserved capacity
GSI/LSI — alternate query patterns (global/local secondary indexes)

When DynamoDB fits

Session store, shopping carts, gaming leaderboards
High write throughput key-value access
Serverless apps with Lambda triggers on streams

Complex relational reports often stay on PostgreSQL or RDS.

List tables

aws dynamodb list-tables
aws dynamodb describe-table --table-name MyLearningTable \
  --query 'Table.{Name:TableName,Status:TableStatus,Items:ItemCount}'

Practice: Use RDS and DynamoDB free tier where eligible. Delete sandbox databases when finished—storage and instance hours can incur charges.

Hot partition awareness

Skewed partition keys (everyone writing the same key) throttle throughput—design keys that spread load (e.g. append suffix shards).

Important interview questions and answers

Q: Partition key role?
A: Determines which partition stores the item—critical for even load distribution.
Q: DynamoDB vs RDS?
A: DynamoDB for massive scale key-value/document access; RDS for SQL joins and ACID relational models.

Self-check

What is a partition key?
Name one workload suited to DynamoDB.

Tip: Design partition keys for even write distribution—avoid one hot key for all users.

Interview prep

Partition key?: Determines which storage partition holds the item—design for even load.
vs RDS?: DynamoDB for massive key-value scale; RDS for relational SQL and joins.

Discussion

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Starter discussion topics

Partition key hot?
When not SQL?

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