> For the complete documentation index, see [llms.txt](https://docs.fractalworks.io/joule/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fractalworks.io/joule/concepts/joule-in-memory-database.md).

# Joule in-memory database

Joule leverages an in-memory database to support advanced use cases

explanation of what is what

## What will we learn on this article?

All about DuckDB

## What are JouleDB & MetricsDB?

### JouleDB

### MetricsDB

## What are use cases in Joule? / How does Joule operationalise this?

## What did we learn on this article?