RE: RPG Blocked Writes

[Kurt Anderson <kurt.anderson@xxxxxxxxxxxxxx>]

Also - is it unique keys, or any keys?  I'm guessing any, but I thought I'd verify.

Thanks,
Kurt

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Campin
Sent: Monday, June 07, 2010 5:30 PM
To: RPG programming on the IBM i / System i
Subject: Re: RPG Blocked Writes

Are there unique keys on the table? That will change it to single record
I/O.

On Mon, Jun 7, 2010 at 4:22 PM, Kurt Anderson
<kurt.anderson@xxxxxxxxxxxxxx>wrote:

> I have a file defined in a program as:
>
>     FFileA     O  A E           K Disk
>
> > From my understanding, writes to this file should be blocked.  However
> when I look at the I/O for the job, the I/O count and the RRN is always
> equal.  For comparison, reading a file that's blocked has a lower I/O count
> than the current RRN.
>
> Is this a matter of me not understanding the I/O screen (when looking at
> the job as it is running), or is this file actually writing a single record
> at a time?
>
> According to this document, I feel that these writes should be blocked.
>
> https://www-912.ibm.com/s_dir/slkbase.NSF/1ac66549a21402188625680b0002037e/d6738e1cd37e1f33862565c2007cef79?OpenDocument
> "All high-level language programs (HLLs) use blocking at certain times and
> use single record I/O at other times, based on program specifications.
> Because blocking takes less system resources to perform a single I/O, a
> program that blocks performs better and uses less system resources. The
> default for the HLL uses record blocking if opening a file for output only
> (write) or input only (read)."
>
> Thanks,
> Kurt Anderson
> Sr. Programmer/Analyst
> CustomCall Data Systems
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