How To Efficently Test Whether An Sql Server Instance Is Running In C#

I have an SQL Server (2008 R2) based (C# WinForms) application that predominantly runs on a local machine using a local installation of SQL Server 2008 R2. One problem I have is th

Solution 1:

I don't think you need to worry about timeouts or network issues when the server and client are the same machine. Just attempting to connect is about efficient as you're going to get, the crucial part is going to be how long do you let the connection attempt try before you give up (connection timeout). You can shorten that window obviously, but if you make it too short, then the problem doesn't really make sense.

Solution 2:

You can change the connection timeout to be a shorter period, but essentially, the only way it knows that a server isn't there, is from a timeout.

Solution 3:

Any technique you use will likely have the exact same timeout issue.

Solution 4:

If you know the instance name, such as "MSSQL$InstanceName" you can use the System.ServiceProcess.ServiceController class to get a list of all services on the machine and then loop through looking to see if any ServiceName == MSSQL$InstanceName.

I have found this to be very fast plus you can check to see if it is running and start it if it is not running.

Solution 5:

You could try opening up a simple TCP connection to the standard SQL port and see if it sticks . set the connection timeout to some reasonably low value based on your environment.

see

http://support.microsoft.com/kb/287932

for sql serevr port numbers.