ePO - On-prem can retrieve data from not only its own databases, but from some extensions as well.
You might need to register several different server types to accomplish tasks within ePO - On-prem. These can include authentication servers, Active Directory catalogs, ePO - On-prem servers, and database servers that work with specific extensions you have installed.
Database types
An extension can register a database type, otherwise known as a schema or structure, with ePO - On-prem. If it does, that extension can provide data to queries, reports, dashboard monitors, and server tasks. To use this data, you must first register the server with ePO - On-prem.
Database server
A database server is a combination of a server and a database type installed on that server. A server can host more than one database type, and a database type can be installed on multiple servers. Each specific combination of the two must be registered separately and is referred to as a database server.
After you register a database server, you can retrieve data from the database in queries, reports, dashboard monitors, and server tasks. If more than one database using the same database type is registered, you are required to select one of them as the default for that database type.