DynamoDB

• Can handle several million queries per second at its peak and respond in milliseconds

• User data in the form of JSON documents, then it is DynamoDB (not RDS)

• key-value store 🡺 DynamoDB

• The maximum item size in DynamoDB is 400 KB,

• On-Demand

  • Your application traffic is difficult to predict (unpredictable) and control,

  • Flash sale

  • Your workload has large spikes of short duration, or if your average table utilization is well below the peak.

  • New applications, or applications whose database workload is complex to forecast

  • Developers working on serverless stacks with pay-per-use pricing

  • SaaS provider and independent software vendors (ISVs) who want the simplicity and resource isolation of deploying a table per subscriber

• Provisioned

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• VPC Endpoints for DynamoDB

  • Helps you to connect to DynamoDB within AWS network (VPC)

  • You need route table entry created for the endpoint.

• DynamoDB Time to Live (TTL)

  • TTL is useful if you store items that lose relevance (delete items) after a specific time

    • Remove user or sensor data after one year of inactivity in an application.

    • Archive expired items to an Amazon S3 data lake via Amazon DynamoDB Streams and AWS Lambda.

    • Retain sensitive data for a certain amount of time according to contractual or regulatory obligations.

    • Orders placed after one month will no longer be monitored

• Secondary Index

  • Search item using more than one key: value

    • tracking ID, or customer ID, or order ID

• minimal operational overhead expenditures 🡺 DynamoDB (not RDS)

• DynamoDB Accelerator (DAX)

  • Fully managed , highly available In-memory caching system used inform of DynamoDB

  • performance improvement from milliseconds to microseconds for DynamoDB