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  3. August 2018

Re: Index Advisor

I think all they did was expose the API they were using all along.

There is nothing, of course, that will stop you from building your own
routine to work the way you want it to, I just question the worth of the
effort.

Furthermore, I'll bet you'll be surprised at what you find after clearing
the results and allowing the system to collect new statistics. There are
times I've had customers use the word "flabbergasted" to see how the
engine behaves after carefully choosing index builds and removing indexes
that are rarely used. You'll see that in the statistics it gathers.

My guess is you won't be quite in that territory since I think you pay
close attention to the engine and how it works, however sometimes a reset
is worth it. You might be surprised at what you see.



Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

On Thu, Aug 9, 2018 at 7:12 AM, Gord Hutchinson <gordm1@xxxxxxxxxxxxxxx>
wrote:

It looks like RESET_TABLE_INDEX_STATISTICS will reset the statistics and
optionally delete the index advices for ALL indexes over a table. Not
exactly what I want.

On Thu, Aug 9, 2018 at 7:57 AM, Gord Hutchinson <gordm1@xxxxxxxxxxxxxxx>
wrote:

I like to remove any advisory that hasn't been recommended in a long
time. When I build an index I like to remove it from the
recommendations.
I don't want to clear everything. I've found that when a library is
deleted, the recommended indexes cannot be deleted unless the library is
recreated.

I used to clear the advisories every month or two. This is a manual
process though and after a while I got out of the habit. It would be
nice
to be able to schedule an SQL to clear the table completely or
selectively.

RESET_TABLE_INDEX_STATISTICS looks like what I want. I'm going to have a
look at that.



Gord




On Wed, Aug 8, 2018 at 7:07 PM, Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx> wrote:

That's correct. If you don't want to see the old advisories anymore,
delete them. The system will start building new ones.

Now there is value in having a good sample because the system will tell
you
things like how often an index is called for, and several other
important
items (materialized query comes to mind) that will change over time and
provide good feedback. I like to see about 90 days or more in there
before
I start messing around too much. And then I need a practiced eye for
the
application too, so that's where a good user expert can help.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

On Wed, Aug 8, 2018 at 4:52 PM, Vernon Hamberg <
vhamberg@xxxxxxxxxxxxxxx>
wrote:

Cool - I kind of thought I remembered seeing something.

So probably the OP doesn't have to do anything with the table he's
looking
at.

Cheers
Vern

On 8/8/2018 12:42 PM, Jim Oberholtzer wrote:

Vern, I think that's already there. On a periodic basis we simply
clear
the advised indexes. Then let the new ones populate.

If we embark on a project to build several indexes then we clear the
advised indexes again and look to see what's being advised after the
work
we did.



Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

On Wed, Aug 8, 2018 at 11:36 AM, Vernon Hamberg <
vhamberg@xxxxxxxxxxxxxxx

wrote:

Hey Gord

How about entering and RFE for IBM to provide tooling to manage
older
recommended indexes? Or is there already something like that?

Vern

On 8/7/2018 12:57 PM, Gord Hutchinson wrote:

I would like to do some cleanup of the older recommended indexes.
As
well,
I have recommendations for indexes in libraries that no longer
exist.
Working with the schemas is ACS is cumbersome since it doesn't
allow
selecting or positioning when in the index advisor. Each time a
recommendation is deleted the display is refreshed thus losing the
positioning. I find the web navigator slow as well.



Gord




On Tue, Aug 7, 2018 at 10:45 AM, Rob Berendt <rob@xxxxxxxxx>
wrote:

"Hard" restrictions can normally be determined by DSPFD and looking
at

Allow read operation . . . . . . . . . . . : Yes
Allow write operation . . . . . . . . . . . : Yes
Allow update operation . . . . . . . . . . : ALWUPD *YES
Allow delete operation . . . . . . . . . . : ALWDLT *YES

This file is flagged as all yes (as shown above). I've seen some
which
were not, such as SYSTABLES, and temporal table log files.

This doesn't address your concern about "admonitions".



Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Gord Hutchinson" <gordm1@xxxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <
midrange-l@xxxxxxxxxxxx
Date: 08/07/2018 10:32 AM
Subject: Index Advisor
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Are there any restrictions, prohibitions, admonitions on updating
QSYS2.SYSIXADV in SQL or a program?




Gord



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