This article relies largely or entirely on a single source. (March 2016)
Amazon DynamoDB is a fully managed proprietary NoSQL database service that is offered by Amazon.com as part of the Amazon Web Services portfolio. DynamoDB exposes a similar data model and derives its name from Dynamo, but has a different underlying implementation. Dynamo had a multi-master design requiring the client to resolve version conflicts and DynamoDB uses synchronous replication across multiple datacenters for high durability and availability. DynamoDB was announced by Amazon CTO Werner Vogels on January 18, 2012.
DynamoDB differs from other Amazon services by allowing developers to purchase a service based on throughput, rather than storage. If Auto Scaling is enabled, then the database will scale automatically. Additionally, administrators can request throughput changes and DynamoDB will spread the data and traffic over a number of servers using solid-state drives, allowing predictable performance. It offers integration with Hadoop via Elastic MapReduce.
In September 2013, Amazon made available a local development version of DynamoDB so developers can test DynamoDB-backed applications locally.
Unlike traditional NoSQL deployments that ask you to think about memory, CPU, and other system resources that could affect your throughput, DynamoDB simply asks you to specify the target utilization rate and minimum to maximum capacity that you want for your table. DynamoDB handles the provisioning of resources to achieve your target utilization of read and write capacity, then auto scales your capacity based on usage. Optionally, you can directly specify read and write capacity if you prefer to manually manage table throughput.
The following table summarizes key DynamoDB pricing concepts.
|Resource Type||Details||Monthly Price|
|Provisioned Throughput (Write)||One write capacity unit (WCU) provides up to one write per second, enough for 2.5 million writes per month||As low as $0.47 per WCU|
|Provisioned Throughput (Read)||One read capacity unit (RCU) provides up to two reads per second, enough for 5.2 million reads per month||As low as $0.09 per RCU|
|Indexed Data Storage||DynamoDB charges an hourly rate per GB of disk space that your table consumes||As low as $0.25 per GB|
DynamoDB exposes performance metrics that helps provision it correctly and to keep applications using DynamoDB running smoothly:
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