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> From: Alexei Pytel
>
>
> Perhaps we are talking about different things...
> You mention "logs" and probably refer to optimizer messages sent to joblog
> in STRDBG mode.

Nope.  OpsNav.

> What I was talking are DB monitor (which sends very detailed - and
> admittedly cryptic - records to a database file) and Visual Explain
> (Operations Navigator plug-in which interprets these records).
> Visual Explain is a GUI interface and it shows a nice flow-chart of a
> query, which steps were taken, in what sequence, how many recorsd were
> selected at each step and what was the cost of the step in terms of how
> many records were processed, how many I/Os were made, etc. etc.
> Exactly your question - why one statement is more expensive then another.
> Usually looks pretty understandable to me ...

Not for me.  Sure, it says in one case 2707 records were selected, and in
another it says 16.  But it doesn't say WHY, at least not in any way that
makes sense to me.

But hey, I guess I'm just too dumb to use the tool.  Fancy that.  After 25
years of programming, over a dozen languages, more than a handful of
operating systems, I've found something I couldn't decipher.  I could read a
timing diagram on a 2651 USART and debug it with an oscilloscope, but I
can't figure out how to read Visual Explain.

Must be gettin' old.

Joe



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