With provisioned capacity mode, you specify the number of data reads and writes per second that you require for your application. You can use auto scaling to automatically adjust your table’s capacity based on the specified utilization rate to ensure application performance while reducing costs. This pricing page details how DynamoDB charges for the core and optional features of DynamoDB. For pricing in AWS China Regions, see the AWS China Regions pricing page.

Key terms

Read capacity unit (RCU): Each API call to read data from your table is a read request. Read requests can be strongly consistent, eventually consistent, or transactional. For items up to 4 KB in size, one RCU can perform one strongly consistent read request per second. Items larger than 4 KB require additional RCUs. For items up to 4 KB in size, one RCU can perform two eventually consistent read requests per second. Transactional read requests require two RCUs to perform one read per second for items up to 4 KB. For example, a strongly consistent read of an 8 KB item would require two RCUs, an eventually consistent read of an 8 KB item would require one RCU, and a transactional read of an 8 KB item would require four RCUs. See Read Consistency for more details.

Write capacity unit (WCU): Each API call to write data to your table is a write request. For items up to 1 KB in size, one WCU can perform one standard write request per second. Items larger than 1 KB require additional WCUs. Transactional write requests require two WCUs to perform one write per second for items up to 1 KB. For example, a standard write request of a 1 KB item would require one WCU, a standard write request of a 3 KB item would require three WCUs, and a transactional write request of a 3 KB item would require six WCUs.

Replicated write capacity unit (rWCU): When using DynamoDB global tables, your data is written automatically to multiple AWS Regions of your choice. Each write occurs in the local Region as well as the replicated Regions.

Streams read request unit: Each GetRecords API call to DynamoDB Streams is a streams read request unit. Each streams read request unit can return up to 1 MB of data.

Transactional read/write requests: In DynamoDB, a transactional read or write differs from a standard read or write because it guarantees that all operations contained in a single transaction set succeed or fail as a set.

Change data capture units: DynamoDB can capture item-level changes in your DynamoDB tables and replicate them to other AWS services such as Amazon Kinesis Data Streams and AWS Glue Elastic Views. DynamoDB captures these changes as delegated operations, which means DynamoDB performs the replication on your behalf so that you don’t have to manage throughput capacity. DynamoDB charges one change data capture unit for each write to your table (up to 1 KB). For items larger than 1 KB, additional change data capture units are required.

DynamoDB table classes: DynamoDB offers two table classes designed to help you optimize for cost. The DynamoDB Standard table class is the default and recommended for the vast majority of workloads. The DynamoDB Standard-Infrequent Access (DynamoDB Standard-IA) table class is optimized for tables that store data that is accessed infrequently, where storage is the dominant cost. Each table class offers different pricing for data storage as well as read and write requests. You can select the most cost-effective table class based on your table’s storage requirements and data access patterns. Learn more about DynamoDB table classes in the DynamoDB Developer Guide.


DynamoDB features and billing overview

Feature

What it does

Billing unit

Core features

 

Provisioned write capacity

Writes data to your table

WCU

 

Provisioned read capacity

Reads data from your table

RCU

 

Data storage

Stores data, including index values

GB-month

Optional features

 

Continuous backup

Takes continuous backups for the preceding 35 days

GB-month

 

On-demand backup

Takes snapshot backups at specified points in time

GB-month

 

Restore from backup

Restores a table to a specific snapshot or time

GB

 

Global tables

Replicates data to create a multi-Region, multi-active table

rWCU

  Change data capture for Amazon Kinesis Data Streams Captures item-level modifications in any DynamoDB table and replicates them to a Kinesis data stream of your choice Change data capture unit
  Change data capture for AWS Glue Elastic Views Captures item-level data changes on a table and replicates them to AWS Glue Elastic Views Change data capture unit
  Data export to Amazon S3 Exports DynamoDB table backups from a specific point in time to Amazon S3 GB
  Data import from Amazon S3 Migrate and load data from Amazon S3 to new DynamoDB tables GB

 

DynamoDB Accelerator (DAX)

Reduces latency through in-memory cache

Node-hour

 

DynamoDB Streams

Provides a time-ordered sequence of item-level changes on a table

Streams read request unit

 

Data transfer out

Transfers data to other AWS Regions

GB

DynamoDB detailed feature pricing


DynamoDB free tier

The AWS Free Tier enables you to gain free, hands-on experience with AWS services. The following DynamoDB benefits are included as part of the AWS Free Tier. Each benefit is calculated monthly on a per-Region, per-payer account basis.

  • 25 WCUs and 25 RCUs of provisioned capacity for tables using the DynamoDB Standard table class
  • 25 GB of data storage for tables using the DynamoDB Standard table class
  • 25 rWCUs for global tables using the DynamoDB Standard table class deployed in two AWS Regions
  • 2.5 million stream read requests from DynamoDB Streams
  • 1 GB of data transfer out (15 GB for your first 12 months), aggregated across AWS services

DynamoDB pricing examples

Additional pricing resources

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