---
title: "xDB index"
slug: "xdb-index"
abstract: "Overview of Sitecore xDB index supported infrastructure, references, and privacy and security."
---
# xDB index

The xDB index contains contact and interaction data, and is updated by the [xConnect Search Indexer](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/xconnect-search-indexer.html "xConnect Search Indexer") service.

<details>
<summary><h2>Supported infrastructure</h2></summary>

You can host the xDB index on:

- Solr

Refer to the [Sitecore compatibility table](https://kb.sitecore.net/articles/087164) for compatible versions.

</details>

<details>
<summary><h2>Reference structure</h2></summary>

The xDB index has its place in the Sitecore reference structure. It can be referenced by other roles, and it can also reference other roles.

![Illustration showing the xDB index's place in the Sitecore reference structure.](https://doc.sitecore.com/api/markdown-image/xp/en/developers/104/platform-administration-and-architecture/images/xdb-index.png)

### Referenced by

The xDB index is referenced by the following roles:

- [xConnect Collection Search service](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/xconnect-collection-search-service.html "xConnect Collection Search service")
- [xConnect Search Indexer](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/xconnect-search-indexer.html "xConnect Search Indexer")

### References

The xDB index does not reference other roles.

</details>

<details>
<summary><h2>Data flows and processes</h2></summary>

The xDB index is used in the following data flows and processes:

- [Indexing and segmentation](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/indexing-and-segmentation.html "Indexing and segmentation")
- [Analytics and reporting](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/analytics-and-reporting.html "Analytics and reporting")
- [Email marketing](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/email-marketing.html "Email marketing")

</details>

<details>
<summary><h2>Privacy and security</h2></summary>

The xDB index handles personal data in the following ways:

- Contains personal data if the [xConnect Search Indexer](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/xconnect-search-indexer.html "xConnect Search Indexer") has been configured to index facets marked `[PIISensitive]`.

</details>