---
title: System overview
related:
  - https://docs.kentico.com/documentation/developers-and-admins/development/caching.md
  - https://docs.kentico.com/documentation/developers-and-admins/configuration/auto-scaling-support.md
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

Xperience provides information about the application and environment running the website and its administration.

To view system information, open the **System** application in Xperience and select **Overview**.

![System overview in the Xperience administration](https://docs.kentico.com/docsassets/documentation/system-overview/System_Overview.png "System overview in the Xperience administration")

| System information      |                                                                                                                    |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------ |
| Machine name            | The name of the server machine on which the system is running.                                                     |
| Uptime                  | The time for which the application has been running and available, since the last restart.                         |
| Server time             | The current time on the server machine.                                                                            |
| Database information    |                                                                                                                    |
| Database name           | The name of the system database.                                                                                   |
| Server version          | The SQL Server version installed on the database server.                                                           |
| Database size           | The current size of the database, including the current data (the .mdf file) and the database log (the .ldf file). |
| Server name             | The name of the database server on which the system's database is running.                                         |
| Memory statistics       |                                                                                                                    |
| Allocated memory        | The size of the memory allocated for the system.                                                                   |
| Process physical memory | Physical memory used by the application's process.                                                                 |
| Process virtual memory  | Memory allocated by the process in the virtual memory space.                                                       |

## Restart the application

You can restart the application by selecting the buttons in the **System information** section:

- **Restart application** – sends a request to restart the Xperience application. The application shuts down and starts up again _if the hosting environment supports automatic application start_. If not, the application remains stopped and inaccessible until it is manually launched.
- **Restart all web farm servers** – sends a restart request to all available applications in [multi-instance environments](https://docs.kentico.com/documentation/developers-and-admins/configuration/auto-scaling-support.md).

> **Tip:** **Restart applications in the SaaS environment**
>
> You can also [restart applications](https://docs.kentico.com/documentation/developers-and-admins/deployment/deploy-to-the-saas-environment/manage-saas-deployments.md#restart-deployed-applications) deployed to [Xperience by Kentico SaaS](https://docs.kentico.com/documentation/developers-and-admins/saas.md) from the Xperience Portal.

## Clear the application cache

Select **Clear cache** in the **Memory statistics** section to remove all [cached content](https://docs.kentico.com/documentation/developers-and-admins/development/caching.md) from the application's memory (server-side cache).

## Optimize database size

Select **Optimize database size** to reclaim space from dropped variable-length (e.g., varchar(max)) database columns. Equivalent to running [DBCC CLEANTABLE](https://learn.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-cleantable-transact-sql) over the Xperience database. This can be a long-running operation depending on database size. You will be notified upon completion.

By default, Xperience by Kentico optimizes the database only during [CI/CD restore operations](https://docs.kentico.com/documentation/developers-and-admins/ci-cd.md). Use this action to run the operation when required. For example, after dropping variable-length columns with a larger number of records. Useful primarily in development enviroments.