# Bulk Writes from S3 to DynamoDB: Bulk Put Items Is Now Generally Available!

Hi, it's Shii-chan!

If you load S3 data into DynamoDB, this one is worth a look!

## What was announced?

In AWS's What's New feed, bulk put items for Amazon DynamoDB is now generally available. It is a fully managed feature that writes data from Amazon S3 into your existing DynamoDB tables.

## The story so far

Writing data that other systems produce and store in S3 into existing DynamoDB tables has typically meant building custom pipelines and managing table capacity.

## What changes

You point bulk put items at the S3 location of your input files, and DynamoDB handles the rest.

- Writes don't impact existing workloads
- No custom ingestion pipeline to build
- Cost-efficient writes

## Dive Deep

**Condition expressions**

Each item supports its own condition expression, so you can enforce insert-only or version-guarded writes.

**Two tiers**

- Standard: fits most workloads
- Accelerated: for more time-sensitive workloads

**Availability**

- Standard tier: all commercial AWS Regions and the AWS GovCloud (US) Regions
- Accelerated tier: limited Regions, so check the regional availability page

**Common use cases**

- Daily refreshes
- Large catalog enrichments
- Backfills
- Migrations

For more, see the DynamoDB blog post and the Amazon DynamoDB Developer Guide.

## Wrap-up

- Fully managed bulk writes from S3 into existing DynamoDB tables (GA)
- No custom ingestion pipeline or capacity management
- Per-item condition expressions enable insert-only or version-guarded writes
- Standard and Accelerated tiers

This is for anyone doing regular data refreshes, backfills, or migrations on DynamoDB!