# Document databases

> Unlocks the Document Store: no schema migrations, and no joins either.

## What it unlocks

[Document Store](https://wiki.playquorum.dev/components/doc.md)

## Prerequisites

It is a root of the Data track. Nothing comes before it.

## Engineering terms

- [Hot key](https://wiki.playquorum.dev/glossary/hot-key.md)
- [Sharding](https://wiki.playquorum.dev/glossary/sharding.md)

## Facts

Document databases
- **Track:** Data
- **Era:** [Series A](https://wiki.playquorum.dev/eras/series-a.md)
- **Cost:** 2.63k 2.63k
- **Requires:** —

## See also

- [Research tree](https://wiki.playquorum.dev/research.md)

Source: https://wiki.playquorum.dev/research/document-db