DynamoDB Advanced Features

DynamoDB Streams

DynamoDB Streams is an optional feature that captures data modification events in DynamoDB tables.
The data about these events appear in the stream in near-real time, and in the order that the events occurred.

DynamoDB is integrated with AWS Lambda so that you can create triggers - pieces of code that automatically respond to events in DynamoDB Streams.
With triggers, you can build applications that react to data modifications in DynamoDB tables.

DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache for DynamoDB that delivers up to a 10 times performance improvement even at millions of requests per second.
If DAX has the item available (a cache hit), DAX returns the item to the application without accessing DynamoDB.
If DAX does not have the item available (a cache miss), DAX passes the request through to DynamoDB.
- When it receives the response from DynamoDB, DAX returns the results to the application.
- But it also writes the results to the cache on the primary node.

DynamoDB transactions simplify the developer experience of making coordinated, all-or-nothing changes to multiple items both within and across tables.
Either all the changes work or none of them do.

DynamoDB on-demand is a flexible billing option capable of serving thousands of requests per second without capacity planning.
DynamoDB on-demand offers pay-per-request pricing for read and write requests so that you pay only for what you use.

A global table is a collection of one or more replica tables, all owned by a single AWS account.
A replica table is a single DynamoDB table that functions as a part of a global table.
Every replica table has the same table name, the same data set and the same primary key schema.
When you create a DynamoDB global table, it consists of multiple replica tables (one per Region) that DynamoDB treats as a single unit.

Last updated 4 years ago

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