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Default trace - A Beginner's Guide


Default trace - A Beginner's Guide

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Adam Haines
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Comments posted to this topic are about the item Default trace - A Beginner's Guide



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I like it, but what's the cost of running this on a production server?

Measure twice, cut once
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Nice one ...



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Adam,
Well done! I think the default trace enabled by default? I checked my installations and it's enabled on all of them.

Mark
Adam Haines
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Dee (11/11/2008)
I like it, but what's the cost of running this on a production server?

I cant really say what the exact cost is because the cost is dependent on multiple factors including usage. I will say that the trace is very light weight. In fact, most do not even know this guy is running in the background.



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Adam Haines
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Mark Horninger (11/11/2008)
Adam,
Well done! Is the default trace enabled by default?

Mark

Yes, you have to tell SQL to explicitly turn off this feature by issuing the sp_configure command.



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Jack Corbett
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Adam,

Nice article. According to BOL you should use sys.traces instead of fn_trace_getinfo. Here is the BOL quote:

The sys.traces catalog view contains the current running traces on the system. This view is intended as a replacement for the fn_trace_getinfo function.


Also if you disable this trace many of the reports available in SSMS will no longer work as they get much of their information from this trace.



Jack Corbett

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Adam Haines
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Jack,

Thanks for the BOL quote. I find it somewhat amusing that MS states that sys.traces should be used instead of fn_get_trace_info on the sys.traces page; however, on the fn_trace_getinfo page makes absolutely no reference to sys.traces (even in the 2008 documentation).

Here is a link to the 2008 documentation
http://msdn.microsoft.com/en-us/library/ms173875.aspx

-Adam



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Jack Corbett
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That is pretty funny.

sys.traces has more information and I find it to be in a more usable format than fn_trace_getinfo.



Jack Corbett

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Adam Gojdas
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For those of us working in "locked down" environments you will need to have 'ALTER TRACE' permission in order to execute fn_trace_getinfo.

Most likely this is the permission you would need for sys.traces, which was mentioned in a reply here, as well.
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