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  3. December 2014

RE: User Space question

Thanks for all that reply.

I know have some things to think about.

Michael

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Bruce Vining
Sent: Saturday, December 06, 2014 9:29 AM
To: Midrange Systems Technical Discussion
Subject: Re: User Space question

As Chuck suggested earlier, a journaled *DATARA approach might be the wiser approach. Use of a *USRSPC, with pointer access, for maintenance of the "next sequential" number might be fast and expedient, but as pointed out earlier doesn't necessarily mean the "next sequential" number is written to auxiliary storage for retention across unplanned system outages. A *DTAARA, for instance, is what the system uses when creating a SQL Sequence (which, if you're not familiar with them, provides a "next sequential" number capability).

As anyone who knows me knows, I use pointers and *USRSPCs a lot. But I would not use them as you are doing in a case where I need to retain changed values across unplanned system outages. If you do want to continue using the *USRSPC approach then Chuck's pointer to Set Access State
(SETACST) would be worth looking at. Personally I would use a *DTAARA.

Bruce Vining




On Fri, Dec 5, 2014 at 12:32 PM, Evan Harris <auctionitis@xxxxxxxxx> wrote:

Hi Rob

You do realize that that pointer addition function would also have to
change to use the new additional function in your example don't you ?
:)

That said, I 100% agree that using pointers is a much easier and IMO
ends up with clearer code.

On Sat, Dec 6, 2014 at 1:08 AM, <rob@xxxxxxxxx> wrote:

I SO much prefer using the pointer method! Once you get past
thinking pointers are some sort of tool of the devil it is so much easier.

For example, let's say IBM announced the rNext of the OS would no
longer support simple addition in RPG. Any new compiles would have
to replace x=y+z; with x=PerformAddition(y : z : '1' : ErrCde);
where the third parameter was whether or not to allow truncation if
the sum of y + z was greater than the size of x, and the fourth
parameter was the standard error code.
Wouldn't that be nuts?
Then why would anyone prefer calling QUSCHGUS over myChar char(10)
based(pmyChar); ...
for x = 1 to ListNumber;
pmyChar=Initial + (OffsetSize * x);
dsply myChar;
EndFor;


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: "Monnier, Gary" <Gary.Monnier@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 12/04/2014 04:05 PM
Subject: RE: User Space question
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Look at QUSCHGUS's parameter 5 - Force changes to auxiliary storage


Force changes to auxiliary storage
INPUT; CHAR(1)
The method of forcing changes made to the user space to auxiliary
storage.
The valid values are as follows:
0

Does not force changes. Normal system management writes the changes
to auxiliary storage.

1

Forces changes asynchronously. This interrupts the normal system
management and ensures that the user space is written to auxiliary
storage.

2

Forces changes synchronously. This interrupts the normal system
management
and ensures that the user space is written immediately to auxiliary
storage.




Or use a pointer to the space (QUSPTRUS api). Obtaining a pointer
to the user space will provide virtually immediate update when the
value for the space is changed.





-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Michael Smith
Sent: Thursday, December 04, 2014 12:39 PM
To: Midrange Systems Technical Discussion
Subject: User Space question



This past week our UPS failed, as a result the building lost power
and
the
iSeries (720 , with V7R1) immediately shutdown.



The only "fall out" has been related to several user spaces that we
use
as
"next sequential" number counters.



The value of the user spaces when the system came back up did not
reflect updates that had occurred during the day, and as a result
various files had duplicate "sequential" numbers.



My question, is there a function for a user space that is similar to
FRCRATIO for a database file?



TIA

Michael Smith





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Regards
Evan Harris
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Regards,
Bruce
www.brucevining.com
www.powercl.com
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