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Display Estimated Execution Time - Client Execution Time


Display Estimated Execution Time - Client Execution Time

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mcertini
mcertini
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I am currently learing about query optimization. Can someone tell me how to interpret within "Display Estimated Execution Time" the "Client Execution Time". I just processed a simple query and the Client Execution Time was quoted at 16:50:30. I was concerned that it meant that my query would take 16 Hours, 50 Minutes and 30 Seconds. Though I haved searched for a while trying to find the interpretation, I finally decided to just run the query and see how long it took. The query took 3 minutes and 4 seconds. Now I am really confused. Can someone interpret this into English for me?
mcertini
mcertini
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Through further research I have found that the time represented by the "Client Execution Time" is the time in which the "Display Estimated Execution Plan" is ran. It is not any estimate of the amount of time in which it would take to execute the query.

So with all of that said, does anyone know how to find an estimated execution time for a query before it is actually ran for the first time?
Jeff Moden
Jeff Moden
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To the best of my knowledge, no such tool exists. Certainly, not an accurate one. Even the actual execution plan is frequently wrong when comparing things such as % of Batch.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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sstrayer-927918
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Client Execution Time is the time you ran the query.
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