Re: REORG

interesting. so you're saying it could be run during regular hours.

On Sun, Apr 3, 2016 at 10:31 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Excellent points but do NOT fail to consider the RBDACCPTH( ) Parm!!!!

The default is *YES. This means that at the end of the reorg significant
effort will be expended rebuilding all the access paths. And if that was
the worst of it that might be OK. BUT if while the file is being
reorganized someone needs to access it via any access path said access path
will be rebuilt IMMEDIATELY while the user waits. If the file is large this
could hurt a LOT.

The option *OPTIMIZE does not help this it simply tells the system to do
what is 'easiest' (for the system) which is either to maintain them on the
fly or rebuild them after the reorg.

The better option if the file is truly in use during the reorg is *NO
meaning the access paths will be continuously maintained. This of course
slows down the reorg even more but your users will be able to continue to
work.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 4/3/2016 9:06 AM, Pete Massiello - ML wrote:

*This message was transferred with a trial version of CommuniGate(r) Pro*

When it comes to performance, deleted records certainly matters, but it
will hurt you more during reads than it will writes. When it comes to LF,
the more you have will hurt you more during writes than it will reads.

The ALWCANCEL(*YES) also known as Reorg while Active parameter, will
always take longer because the file MUST be journaled and each
read/delete/write will therefore hit the journal, as there can be others
using the file during this time as well. It's basically moving the records
in the file to all be in the front of the file, and then chops off the
space at the end. A regular reorg will always be quicker.

While doing things in restricted state might be faster, be careful that
people don't think you should be reorg-ing files in a restricted state, as
that effects the time people have in downtime. We try to just reorg files
when they aren't in use, and of course some files are always looked and we
have to bring the applications down to get them. But other applications
could still be up.

Just some comments on your observations.

Pete

Pete Massiello
iTech Solutions
http://www.itechsol.com
http://www.iInTheCloud.com

Office: 203-744-7854




-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Bruno Alexandre Miatto Clemente
Sent: Friday, April 01, 2016 3:04 PM
To: Midrange Systems Technical Discussion
Subject: RE: REORG

Hello,

We've made some research and experiments on reorgs a while ago. Let me
share our experience:

1. The number of deleted records matters as much as the number of LFs 2.
Using ALWCANCEL *YES is considerably more time consuming.
3. It is suggested to perform the task in restricted state for a better
performance 4. Even in restricted state, there is a limited number of
threads for path rebuild process. We've optimized it setting all the
entries with *OPN and submitting jobs with OPNDBF command for each one of
the paths increasing the number of parallel threads.
5. The best results came with RBDACCPTH(*OPTIMIZE) ALWCANCEL(*NO) within
the item 4.

This is my own opinion and may not match IBM's.

My best regards,

Bruno A. M. Clemente
Mainframe Support Brazil Team Leader
IT Service Management Foundations Certified (ITIL) IBM i 6.1
Administration Certified

"Follow the path of the unsafe, independent thinker. Expose your ideas to
the danger of controversy.
Speak your mind and fear less the label of "crackpot" than the stigma of
conformity." - Thomas J. Watson





From: Alan Shore <ashore@xxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 04/01/2016 03:44 PM
Subject: RE: REORG
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



There is a way that you can run RGZPFM with the parameter in the command
of ALWCANCEL *YES Provided the file you want to do this to is journalled
otherwise that file cannot be touched while the RGZPFM is running,


Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Hoteltravelfundotcom
Sent: Friday, April 01, 2016 2:24 PM
To: Midrange Systems Technical Discussion
Subject: REORG

I am going to run A file reorg, RGZPFM on Sunday early.
my question is, what happens if it's still running at the nightly backup
time which would be nearly 24 hours later?

I don't have figures yet but does it matter if there are large amt of
deleted records or is the time consuming more, if there are multiples of
logicals that have to be rebuilt
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