Comments on: Autotrace

By: Jared

Jared — Fri, 02 Dec 2011 18:52:58 +0000

An oldie, but a goodie. There are still 9.2.0.6 databases out there – working on one now.
Thanks Jonathan.

By: Amarnath

Amarnath — Mon, 12 Mar 2007 04:28:57 +0000

Hi,

I want to know is it possible to store the traces in a file. so that I can use auto trace for many procedures and I’ll see all the traces in one file.

Please help me.

Thanks in advance,
Amarnath

By: Howard Rogers

Howard Rogers — Wed, 29 Nov 2006 21:57:33 +0000

Thank you very much for that Jonathan!

You live and learn, I guess.

At least my comfort levels are restored to some degree of normality by noting the very special circumstances under which the ‘hypothetical only’ stuff happens.

Thanks for taking the time to indulge me.

By: Jonathan Lewis

Jonathan Lewis — Wed, 29 Nov 2006 09:31:21 +0000

Howard, I have created a separate page which I hope demonstrates this point. Of course, 10gR2 does give us the option to get the "real" execution plan very easily - but at the expense of running the query - by making a call to dbms_xplan.display_cursor().

By: Howard Rogers

Howard Rogers — Wed, 29 Nov 2006 05:39:32 +0000

Could you post something to prove the truth of that last sentence?

For a very long time, Oracle courseware has taught that autotrace always executes, its one drawback compared with, say, explain plan (but also its advantage, in that the plan you see is the one that was actually used, not a hypothetical one).

I’ve gone along with that without thinking about it for years… and now you make me do a double-take!

In the nicest possible way: evidence please!