XenApp 7.5 uses Microsoft SQL databases for site configuration, change logs, and monitoring.
In previous versions of XenApp, the database was important, but it only held persistent information and not session data, so the loss of database connectivity was not a catastrophic failure. With the new FMA architecture, the database is now critical for all operations. The site database contains persistent configuration information, real-time session data, and configuration change logs. It is important to note that if connectivity to the database is lost, no changes can be made to the site (Studio will be unavailable) and new connections cannot be made.