---
title: "Search index descriptions"
slug: "search-index-descriptions"
abstract: "The search indexes required when configuring servers for scalability."
---
# Search index descriptions

When you set up Sitecore servers for scalability, you must also configure a search and indexing provider. In Solr, search indexes are referred to as cores.

The following table describes the default search indexes available in Sitecore:

| Index name | Refers to |
| --- | --- |
| `sitecore_core_index` | The Core database and the items that define the Sitecore CMS interfaces. |
| `sitecore_master_index` | The Master database that contains all versions of every item, including unpublished versions. This is everything related to the published website. |
| `sitecore_web_index` | The Web database that contains only the published versions of every item in all languages. |
| `sitecore_marketingdefinitions_master` | The marketing definition data that is stored in the master database.<br><br>It is only used on the content management environment and is not shared. |
| `sitecore_marketingdefinitions_web` | The marketing definition data that is stored in the Web database.<br><br>It is only used on the content delivery environment and is not shared. |
| `sitecore_marketing_asset_index_master` | The marketing asset data that is stored in the Master database.<br><br>It is only used on the content management environment and is not shared.<br><br>Use the marketing operations API to query marketing assets. |
| `sitecore_marketing_asset_index_web` | The marketing asset data that is stored in the Web database.<br><br>It is only used on the content delivery environment and is not shared.<br><br>Use the marketing operations API to query marketing assets. |
| `sitecore_personalization_index` | The [personalization index](https://doc.sitecore.com/xp/en/developers/104/platform-administration-and-architecture/personalization-index.html) stores information about which page definition items in the content tree are personalized and which personalization rules the pages use. The index is used in Experience Optimization by the [Personalization dashboard](https://doc.sitecore.com/xp/en/users/104/sitecore-experience-platform/using-the-personalization-dashboard.html). |
| `sitecore_testing_index` | The test definition items used in the test lists in Experience Optimization and the Experience Editor. This does not include the suggested tests list.<br><br>It is also used in the Sitecore client UI to report on any tests present on an item. |
| `sitecore_suggested_test_index` | Provides storage for computed values for all of the content items in the content tree, and is used to suggest the items that should be optimized.<br><br>This index drives the suggested test list in the Experience Optimization and inside the Experience Editor. It is also used in the Sitecore client UI to show when a test has ended. |
| `sitecore_fxm_master_index` | All versions of every item on your FXM websites. Changes that you make to the content are added every time the index is rebuilt.<br><br>It is only used in the content management environment and is not shared. |
| `sitecore_fxm_web_index` | The published versions of every item on your FXM websites. Changes that you make to the content are added every time the index is rebuilt. |