Re: Database server jobs and SQL tuning

From John Sears . . . .


************
Have a great day!

Anne C. Lucas
AS/400 WW Education/Services Strategy

Peace: not absence of conflict, it's the ability to cope with it

Offc 205/823-4831  Home t/l 537- 9968
Fax 603-687-8053
Pager 800/223-3907
alucas@us.ibm.com


---------------------- Forwarded by Anne Lucas/Birmingham/IBM on 05/18/2000
07:31 AM ---------------------------

MacWheel99@aol.com@midrange.com on 05/18/2000 01:12:22 AM

Please respond to MIDRANGE-L@midrange.com

Sent by:  owner-midrange-l@midrange.com


To:   MIDRANGE-L@midrange.com
cc:
Subject:  Re: Database server jobs and SQL tuning



>  From:    DBale@lear.com (Bale, Dan)
>
>  Wow.  Is this documented, Al?  Could you point to some kind of reference
> if you have it handy, please?

I was taught this in IBM school ... one of the programming classes ... I
will
try to dig up where it is in black & white in one of the IBM hand-outs.
The
IBM Professor took 1/2 an hour or so of drumming this point into us, in
lecture, exercises, and review questions.  I know it applies in the RPG &
CL
programming that I do ... I just do not know if it applies to SQL, ILE
across
the board.  I have a sneaking suspicion that it may apply to Query.

This was in an IBM programming class in 1999 & it was applicable to RISC
boxes.

If you want good security - fine, qualify stuff - but understand that there
is a commensurate performance hit.

> When we use library list, the user profile gets hit ONE time to verify
that
> user has authority to the objects in the list.  If you qualify access to
an
> object by what library it is in, AS/400 has to verify security authority
> every time you specify the library, irrespective of whether that was
> validated 2 microseconds ago on another line of code or even is inside
the
> library list being used.
> Thus, depending on how you qualify object locations
> in your code, and your use of library list, it is possible to totally
wipe
> out performance, without gaining any security benefits whatsoever.

Al Macintyre  ©¿©
http://www.cen-elec.com MIS Manager Programmer & Computer Janitor
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