I have to echo your last line from personal experience:

If you have looked at a bug for 30 or more minutes, get that second set of eyes 
to look at it pronto. 

Chances are they will spot it in under 30 seconds!  :-)

Bob

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Elardus Engelbrecht
Sent: Monday, March 18, 2013 9:21 AM
To: [email protected]
Subject: Re: Query for Destination z article -- mainframes back to the future

Shmuel Metz (Seymour J.) wrote:
> Have a plan B.

And C and D, etc... ;-D

> Document first, then keep your documentation up to date.

And have someone else review it.

And document all and every exits. (source, logic flow and installation methods)

> Don't update the running system.

Some people did that - at their own risk.

And P L E A S E Don't INIT a live IPL volser!

> Use vendor-provided mappings rather than rolling your own.

Good suggestion, that is, if supplied mapping is available in the first place. 
Think OCO.

(It took me a long time to obtain SMF mappings from IBM for a certain product 
for which I need to extract accounting info for usage analysis... So I ended 
used both version - vendor and my own.)

>A few coding techniques for newbies to learn:
> The use of UNPK and TR for converting to hexadecimal.

And do that in RENT and REUS modes too. ;-)

I wish to add something too: If you're having trouble debugging something, an 
extra pair(s) of eyes is a welcome investment.


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