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SQL Server 2008 CLR Table-Valued function works exactly twice, then fails unless assembly reloaded.

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :

Very simple TVF UDF uses WebRequest and HttpWebReponse, passing the response stream off to custom class that implements IEnumerable. First invocation has a good delay (seen many other posters on this issue), second invocation is lightening fast, then all calls after that produce this error:

Msg 6522, Level 16, State 1, Line 1
A .NET Framework error occurred during execution of user-defined routine or aggregate "tvf_OneMinuteBars":
System.Net.WebException: The operation has timed out
   at System.Net.HttpWebRequest.GetResponse()

Now, I've tried all manner of settings on the webrequest: KeepAlive, Timeout (currently 15 secs), Proxy = null. But I just can't figure it out. What is really a bummer is that I can debug invoke this against a local SQL Server as many times as I like. But if I deploy (in VS) to two different servers, or if I manually copy the assembly to the servers and do the CREATE ASSEMBLY / CREATE FUNCTION manually, it always times out after the second invocation.

Here is the tricky part: the object calling GetResponse calls HttpWebResponse.GetResponseStream(), storing the reference in a property. Then the object reference passed to the constructor of a custom class implementing IEnumerable, which does the right things with the response stream. Super fast, n

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