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  1.  Home
  2. SYSTEM21
  3. April 2011

Re: Embedded SQL Performance Issues

I was/am in your shoes.

We are using Aurora 1.2 (regular) and just upgraded from V5R4 to V6R1 about two weeks ago.

We ran IBM's tool and it identified a handful of programs that would not be compatible, but the only JBA programs were in the PTF manager libraries, which we haven't used in a while.

We have a handful of programs that have SQL embedded and everything seems to be fine with one exception. For some reason, 1/APY (PL431) runs agonizingly slow. Hudson gave us a suggestion of creating a couple of new logicals to speed it up, which I have done, but won't know until later this afternoon if it works.

The only other issue we had was with our e-comm website. Our site has ASP code with SQL that queries the AS/400 and a couple of our SQL's with JOINS fell over. All I had to do to make them work was change the order of the files at the beginning of the SQL statement and now they work fine. Apparently IBM tightened up on the syntax of SQL when accessing the AS/400 through ODBC, and our old code wasn't compliant with today's standards.

Good luck!

Randy Rasp
AER Manufacturing


On Wed, Apr 20, 2011 at 5:02 PM, Janith Wanigasekara wrote:

Hi Everyone

We are at Aurora 1.2 (Style) and about to upgrade the OS from v5r4 to v6r1
(This weekend). We use embedded SQL in lot of the programs. I would like to know if anyone using Aurora style has done the above upgrade
before and come across any issues at all.


Thanks in advance Janith

-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx [mailto:system21-bounces@xxxxxxxxxxxx]
On Behalf Of Hudson McVay
Sent: Thursday, 21 April 2011 6:31 a.m.
To: 'System 21 Users'
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

Great!

Glad it worked.

As for the users, you are on your own.

Hudson

-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx [mailto:system21-bounces@xxxxxxxxxxxx]
On Behalf Of Prill, Steve
Sent: Wednesday, April 20, 2011 1:50 PM
To: System 21 Users
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

Hudson,

WOW, WOW, WOW!

I typed STRDBMON on an iSeries command line, prompted it (F4), and entered a
file and library on the OUTFILE parameter and left the default for all of
the other parameters. I then ran the program with the SQL performance
problem and when it was done did ENDDBMON. I then used the RUNQRY command
over the file I entered on the STRDBMON command. The query output shows the
"Advised Keyed Columns" (the logicals that you need to create) in column 920
of the file. The file used can also be seen in position 455 of the query.

I created the logicals suggested in the query and the program with the
performance problem runs almost instantly now.

I appreciate all of the help with this.

You people are the best and there is always someone willing to help.
Now if I could just get the users out of this "it's always been that way"
mode.

Any suggestions? Just kidding.

Thank you-------

Steve Prill | I.T. Manager | Rexair LLC |50 W. Big Beaver Rd. Suite 350 |
Troy, MI 48084 | 248-816-8627 | fax 248-524-2191 | sprill@xxxxxxxxxxxxx
 


-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx [mailto:system21-bounces@xxxxxxxxxxxx]
On Behalf Of Hudson McVay
Sent: Wednesday, April 20, 2011 11:08 AM
To: 'System 21 Users'
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

Whatever I used came with the system. Either in Navigator or STRDBMON.
A google search will bring up some redbooks on performance tuning, that's a
place to start.
I believe in was in Navigator where it suggested what views to build.
I just don't remember what I did or how I got there.

You should just have to create the logicals (views) and at run time the sql
optimizer will use the new view.
You should notice the speed increase the next time you run payments.

I did not make any changes to PL431 but I have recomplied PL431 for another
different mod.

Hudson



-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx [mailto:system21-bounces@xxxxxxxxxxxx]
On Behalf Of Randy Rasp
Sent: Wednesday, April 20, 2011 10:44 AM
To: System 21 Users
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

I am very anxious to try Hudson's suggestion.

Do I just create these logicals over PLP15? Do I need to change PL431 to
use the new logical? PL431 currently uses PLP15 in the declare code. Will SQL figure out that it has a better access path and start using it?

Thanks everyone!


On Wed, Apr 20, 2011 at 9:38 AM, Prill, Steve wrote:

Hudson,

Are the SQL monitors already on the system? How do you use them?

Thanks----

Steve Prill | I.T. Manager | Rexair LLC |50 W. Big Beaver Rd. Suite 350 | Troy, MI 48084 | 248-816-8627 | fax 248-524-2191 | sprill@xxxxxxxxxxxxx
 


-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx
[mailto:system21-bounces@xxxxxxxxxxxx] On Behalf Of Hudson McVay
Sent: Wednesday, April 20, 2011 10:09 AM
To: 'System 21 Users'
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

Does sound like an index problem.
I had the same issues a few years ago with 1/APY - report payments due also, went from seconds to hours to run I used one of the sql monitors to view what was being processed, it suggested what views to create.
Created the views and that did fixed it.

For the 1/APY issue I created 2 views,

R PLR15 K LOGI15 K CONO15 K SUPN15 K CURN15 K PDUE15 K ETYP15 K LREF15
And

R PLR15 K LOGI15 K CONO15 K SUPN15 K RSTS15
Worked for me, your milage may vary.

Hudson McVay


-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx
[mailto:system21-bounces@xxxxxxxxxxxx] On Behalf Of Randy Rasp
Sent: Wednesday, April 20, 2011 9:53 AM
To: System 21 Users
Cc: SYSTEM21@xxxxxxxxxxxx
Subject: Re: [SYSTEM21] Embedded SQL Performance Issues

Steve -

Did you just upgrade your operating system to V6R1 by chance?

We never had performance problems in the past, as our AS/400s in recent years has been oversized.

We upgraded to V6R1 two weekends ago and I am now getting sporadic reports of jobs that appear to be stuck. When I investigate it's always a RPG program with embedded SQL. The jobs are running, they are just VERY slow.

One job in particular is 1/APY - report payments due. It used to take only 15-20 seconds to complete, and it now takes over 45 minutes.
When this job is running, our CPU jumps to 75+ % utilization. Prior to V6R1, our AS/400 was rarely above 10%

When this job is running, the program stack indicates that it's called a program in QSYS called QSQROUTE.

I signed onto Fix Central and we have all of the latest PTFs from IBM.

I am not sure what to do at this point.

Randy Rasp
AER Manufacturing



On Wed, Apr 20, 2011 at 7:25 AM, Prill, Steve wrote:

We are at 3.5.2 SP3. A user complained to me about the performance when the quantities were changed on a Bill of Material via menu MDM option
21
(Routes/Structures). This has been occurring forever but we are just now hearing about it. It was taking about 20 seconds to change the quantity on one part but when they would change two of more quantities then press F8 to update it could take 3 or 4 minutes to complete the update. I had a vendor look at the application and they found an issue with the embedded SQL. They found and fixed the issue in program DB590 and the update is now nearly instantaneous. In this case they had to create a new logical and modify the SQL.


Today another user complained about the performance, that has been occurring forever, when using the "Routes/Structures Audit" (MDE option 8). After a part/route is entered and a change is selected via "2=Route Structure Inquiry" and enter is pressed on the next screen, it can take up to 5 minutes to get to the screen titled "Process Route Audit Inquiry
- Inputs". The issue appears to be with various SQL statements in program DB561.

There seems to be a pattern here and I know there are many other SQL programs in System 21 and I now wonder if this performance issue is occurring in other programs but our users have just learned to live with it. In the 8/MDE problem above the users have simply chosen not to use the option.


Has anyone else experienced similar issues with embedded SQL and maybe found a fix? Unfortunately, we do not know how to troubleshoot embedded SQL issues. I know my vendor can look into it and fix it but wonder if there is a general fix for these type of issues with embedded SQL that my programmers can look into.


Thanks in advance for your input.


Steve Prill


Steve Prill | I.T. Manager | Rexair LLC |50 W. Big Beaver Rd. Suite 350
| Troy, MI 48084 | 248-816-8627 | fax 248-524-2191 |
sprill@xxxxxxxxxxxxx <mailto:sprill@xxxxxxxxxxxxx>


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