sql server - Question about Time Statistics, Execution Plan and "print" -

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Which field of a large query I am trying to test, which is why I have performed three steps Including the plan, setting the time figures, and printing immediately before and after those sections which I believe can lead to problems. Example: 

  '1' selection ID '2' with print print

When I look at my execution plan, it says that a certain Taking the section is a big percentage of "cost" when I compare this percentage for the time that ends in between my print '1' and print '2' I do, it seems that there is no way that the percent is even closer

whether it is printed on the estimated cost and time Sector is a safe bet to rely on statistics? If this happens then can it focus on those areas which have passed a big time between the printed values ​​rather than the estimated costs?

If you print only '1' and print '2', then when you print your sms If you see messages in the message pane, you are falling prey to buffering output between the server and the client. The client can not immediately send back the ' print' 1 ' , and SQLEclient, ADOnate and SSMS also do some buffering of their own, then overall you will get your SSMS results On the way of the message panel, you can see '1', in the way exactly later than that. There is a very good time (only), not just '1'. In this way you get buffering from the equation and you can see it in your message only when the server executed the 'print', not the time When its output was displayed by the SSMS.

Set stats are always more accurate, but sometimes it is difficult to tell which statement really rejects again.

Everything I do is like this: 

  declare @ nostestring varchar (100); Announce @ Start DateTime, @ and Datetime, @RC Int, Element Int; Set @start = getdate (); Select many, condition = complex on many titles in fields from large locations where matches match = many different types of matches; Set @rc = @@ rowcount; Set @end = getdate (); Set @elapsed = datediff (ms, @start, @end); Set @nowString = dar (varchar (100), getdate (), 14); Raiserror (n '% s: Selected% i rows in% i ms on selection no. 1, 10, 1,% string now, @rc, @ filled); Set @start = getdate (); ... Next Select Here ...

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