I want to add database connection to SQL Server from ArcMap.
But, I don't know what to write as 'instance'. I've tried 'NT Service\MSSQLSERVER' but it doesn't work.
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If you installed SQL server with default instance on your computer, then just write ".\". It means localhost.
You can find instance name from services in windows:
Go to windows services => find SQL Server.The default instance name is MSSQLSERVER.
Other instance names also are between parentheses.
If SQL server installed on a server and you want to connect to this, you should use server IP (You may need a VPN). In the below image you can see an IP and an instance name (not default instance).You maybe need to use a port for connecting to a server like this: (192.0.0.0:2222\instancename)