>> I do not have to know (every single detail) how internally one airplane
>> works, but if I know all the possibilities of the airplane and how to
>> use them efficiently, it is enough for me to make my flight efficient
>> and comfortable.

This is true until that airplane decides that it's not going to work as
advertised. Once something fails, then knowing as much about that airplane
as possible can make dealing with the problem much easier and can help one
avoid a nasty crash. For example, in my airplane, if my AI fails, knowing
how to detect that it's failed (suction failure perhaps indicated by the
suction gauge) and properly interpreting the other performance instruments
(dg, altimeter, vs, etc...) makes the flight a whole lot better for me and
all those on board. There is something disconcerting about seeing the ground
rolling out below you at 500 AGL in a spiraling dive...

ASM, SQL, etc... are all the same. When things work like you expect they
will, life is great. The Optimizer gives you a good execution plan and your
query works fine. It might even be that the optimizer gives you a *bad*
execution plan and everything still works fine.

It's when those nasty problems occur that the men are separated from the
boys. Those who know (or know how to quickly find the answers) succeed.
Those who don't fail (or call support). I prefer to be in the former group
as much as possible (but I freely admit to many times when I fell in the
second group).

That being said.... technology is so intertwined and so layered, that it's
hard to know everything anymore, even hard to understand everything anymore.
So, if you don't know the answer, at least know who it is that will know the
answer. :-)

RF

-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Sunday, June 11, 2006 1:39 PM
To: oracle-l@(protected)
Cc: kevinc@(protected)
Subject: Re: RAC and ASM disk layout


Depends of how you understand "if you know the way how it works"...I
do not have to know (every single detail) how internally one airplane
works, but if I know all the possibilities of the airplane and how to
use them efficiently, it is enough for me to make my flight efficient
and comfortable.
Like in a Formula 1 race, Michael Schumacher knows how to efficiently
use and drive good car designed by good engineers, and he was 7 time
world champion :-) Give one of those good engineers to drive this car,
he won't even finish the race :-)

I am not saying that a ASM is perfect (CBO is not perfect also) and
that can be used in every
situation, but if used properly in right situation, can make a life of
a DBA much easier.
Kevin, from a database point of view, could you please explain what we
can not do with the ASM?

Cheers,
Goran
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