This section describes the SQL server architecture options and performance considerations. What to read next General Performance NotesApp Control Server relies on a SQL Server database for storage of all file, computer, and other data it collects. Therefore, the performance of App Control Server is strongly influenced by the performance of the underlying SQL Server. App Control Server One-tier ArchitectureIn order to simplify configuration and ensure fast connectivity between the App Control server and SQL server, the App Control “Operating Environment Requirements” (OER) specifies that both products must be installed on the same machine. App Control Server Two-tier ArchitectureSometimes, however, a one-tier deployment of App Control is not possible because it conflicts with company policies mandating that all databases must be located in a data center and managed by a separate team.