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I will address your 2nd question. As far as i know, there's no timeout mechanism to terminate tabprotosrv.exe
so they never expire. That being said, i do not believe that the "max_duration 60" is reffering to the tabprotosrv process, but rather to an attached vizql process linked to it. as the path shows on the detailed view. I hope it helps clarifies a little.
thanks for the clarification. My hunch is that the problem is on our DW tech internals where the query may be timing out as results are being returned to Tableau. But Tableau is not receiving a message back saying that it's incomplete data. It's really hard to prove though, but this is where I'm at right now.