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CDK Constructs for AWS DynamoDB

Project description

Amazon DynamoDB Construct Library


Stability: Stable


Here is a minimal deployable DynamoDB table definition:

import dynamodb = require('@aws-cdk/aws-dynamodb');

const table = new dynamodb.Table(this, 'Table', {
  partitionKey: { name: 'id', type: dynamodb.AttributeType.STRING }
});

Keys

When a table is defined, you must define it's schema using the partitionKey (required) and sortKey (optional) properties.

Billing Mode

DynamoDB supports two billing modes:

  • PROVISIONED - the default mode where the table and global secondary indexes have configured read and write capacity.
  • PAY_PER_REQUEST - on-demand pricing and scaling. You only pay for what you use and there is no read and write capacity for the table or its global secondary indexes.
import dynamodb = require('@aws-cdk/aws-dynamodb');

const table = new dynamodb.Table(this, 'Table', {
  partitionKey: { name: 'id', type: dynamodb.AttributeType.STRING },
  billingMode: dynamodb.BillingMode.PAY_PER_REQUEST
});

Further reading: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadWriteCapacityMode.

Configure AutoScaling for your table

You can have DynamoDB automatically raise and lower the read and write capacities of your table by setting up autoscaling. You can use this to either keep your tables at a desired utilization level, or by scaling up and down at preconfigured times of the day:

Auto-scaling is only relevant for tables with the billing mode, PROVISIONED.

const readScaling = table.autoScaleReadCapacity({ minCapacity: 1, maxCapacity: 50 });

readScaling.scaleOnUtilization({
  targetUtilizationPercent: 50
});

readScaling.scaleOnSchedule('ScaleUpInTheMorning', {
  schedule: appscaling.Schedule.cron({ hour: '8', minute: '0' }),
  minCapacity: 20,
});

readScaling.scaleOnSchedule('ScaleDownAtNight', {
  schedule: appscaling.Schedule.cron({ hour: '20', minute: '0' }),
  maxCapacity: 20
});

Further reading: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/AutoScaling.html https://aws.amazon.com/blogs/database/how-to-use-aws-cloudformation-to-configure-auto-scaling-for-amazon-dynamodb-tables-and-indexes/

Amazon DynamoDB Global Tables

Please see the @aws-cdk/aws-dynamodb-global package.

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