---
title: "The search indexes required in a scalable environment"
slug: "the-search-indexes-required-in-a-scalable-environment"
abstract: "This topic provides a list of which search indexes you require for each type of server in a scaled environment."
---
# The search indexes required in a scalable environment

Sitecore comes with a default set of [search indexes](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/search-index-descriptions.html "Search index descriptions") that along with your search and indexing provider help to improve the performance of your website search.

When you configure Sitecore servers in a scalable environment, we recommend that you use Solr as your search and indexing provider.

You must configure the indexes you need on each server. As a general rule, on the server you are configuring, you only need the indexes that correspond with the databases that you use. For example, if you are configuring a content delivery server, you need the Web database and the `sitecore_web_index`.

<details>
<summary><h2>Sharing indexes</h2></summary>

In Solr, the index storage is centralized and can be shared across multiple servers. Keeping indexes synchronized across servers is therefore easy and requires only a few indexing strategies.

For example, if you have two content management servers that both need to access the same `sitecore_master_index`, one content management server could maintain the index and share it or you could have a dedicated server responsible for maintaining all your indexes.

</details>

<details>
<summary><h2>Indexes required on servers in a scalable environment</h2></summary>

The following table describes the Sitecore search indexes that are required for different types of servers in a scaled environment:

| **Server type** | **Search indexes required** |
| --- | --- |
| Content delivery | `sitecore_web_index`<br><br>`sitecore_marketingdefinitions_web`<br><br>`sitecore_marketing_asset_index_web`<br><br>`sitecore_fxm_web_index` |
| Content management | `sitecore_core_index`<br><br>`sitecore_master_index`<br><br>`sitecore_web_index`<br><br>`sitecore_marketingdefinitions_master`<br><br>`sitecore_marketing_asset_index_master`<br><br>`sitecore_fxm_master_index`<br><br>`sitecore_fxm_web_index`<br><br>`sitecore_testing_index`<br><br>`sitecore_suggested_test_index` |

</details>