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DynamoDB cheat sheet & developer notes

DynamoDB cheat sheet and 3 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · DynamoDB

CRUD Operations & Queries

DynamoDB: CRUD Operations & Queries. AWS SDK v3 — Node.js. import { DynamoDBClient } from '@aws-sdk/client-dynamodb' import { DynamoDBDocumentClient, GetCommand, PutCommand, UpdateCommand, DeleteCommand, QueryCommand, Sc…

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02 · DynamoDB

Data Modeling & Core Concepts

DynamoDB: Data Modeling & Core Concepts. DynamoDB is AWS's fully managed NoSQL key-value and document database. It provides single-digit millisecond latency at any scale with automatic horizontal scaling. The data model …

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03 · DynamoDB

GSIs, Streams, DynamoDB Local & Interview Questions

DynamoDB: GSIs, Streams & Interview Questions. Global Secondary Indexes (GSI). GSIs let you query on non-primary-key attributes. Each GSI has its own PK and optional SK, and maintains its own copy of the data — eventuall…

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Concepts to know for DynamoDB

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CAP Theorem in PracticeWhat CAP really constrains (only behaviour during a partition), why "pick two" is wrong, and how PACELC, quorums and consistency models become design choices.Intermediate·14 minConsistent HashingWhy hash(key) mod N remaps everything when N changes, how a hash ring moves only 1/N of keys, what virtual nodes fix, and where rendezvous, jump and Maglev fit.Intermediate·12 minDatabase Sharding and PartitioningHow a partition key splits a table, why sharding the pieces across machines makes that key decide every query, and how to reshard without downtime.Advanced·14 min

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