Re: What is this file used for: QABXLFN?

Darryl,
If you create an SQL TABLE, you are creating a physical file.
If you create an SQL VIEW, you are creating a logical file.
If you create an SQL INDEX, you are creating a logical file.
Just saying ...
Mark S. Waterbury

On Friday, May 7, 2021, 4:55:16 PM EDT, a4g atl <a4ginatl2@xxxxxxxxx> wrote:

The 1 PF has 2 million records. There are 5 indexes on it. I do not use
physical or logical files. This is new development and am using tables,
indexes and views only.
The tables being updated have less than 5,000 records each.

I IPL'd the machine today and will work on the issue again over the
weekend. I need to do a RCLSTG to see if that is needed. I am at 50% disk
utilization.

Darryl.

On Thu, May 6, 2021 at 8:51 AM Patrik Schindler <poc@xxxxxxxxxx> wrote:

Hello Darryl,

Am 06.05.2021 um 13:34 schrieb a4g atl <a4ginatl2@xxxxxxxxx>:

I know what the file is used for, but the question is why is the system

doing so much I/O on this file?

Sorry, I can't help you from experience here.

Out of curiosity: How big is that LF? On a mostly bored 7.2 install, it's
184KB with 2900 rows, on my old 150, it's 112KB with 1900 rows. I expect
that files that small fit in RAM with no efforts. I remember somehow that
LFs are for reading only, so I don't expect that your observation relates
to direct changes to this file, but maybe access path updates through
changes of the accompanying PF. Does your QADBXREF encounter heavy I/O
also? Does your system create and delete a lot of temporary (SQL) table
objects?

In addition, you can try to use the iACS Database SQL debugging features
on that file to see if you can get more information on what's going on.

:wq! PoC

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