SQL Server installations and databases (explained)
The management server, the event server, the log server, 
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Surveillance: Management and event server
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Surveillance_IDP: IDP
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Surveillance_IM: Incident Manager
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LogserverV2: LogServer
 
The management server and the event server share the same SQL Server database while the log server, 
The system installer includes Microsoft SQL Server Express which is a free edition of SQL Server.
For very large systems or systems with many transactions to and from the SQL Server databases, Milestone recommends that you use the Microsoft® SQL Server® Standard or Microsoft® SQL Server® Enterprise edition of SQL Server on a dedicated computer on the network and on a dedicated hard disk drive that is not used for other purposes. Installing SQL Server on its own drive improves the entire system performance.
To see a list of supported SQL Server versions, go to https://www.milestonesys.com/systemrequirements/.
For more information about the Identity Provider, see Identity Provider (explained).