|
So in our conversion meeting yesterday, the CHGPF was discussed. Later
someone forwarded and OLD article to me from 2013 about a problem with
CHGPF
relating to PF and LF record formats not matching (link below). At the
bottom of the article, it says the article was written for V7.1. We are
running on V7.3. Does anyone know if this is still an issue or do I need
to
do some digging to find out if any record formats do no match?
https://www.rpgpgm.com/2013/06/chgpf-theres-quirk-that-can-bite-your.html#:~
:text=The%20Change%20Physical%20File%20(CHGPF)%20is%20a%20useful,the%20follo
wing:%20Delete%20all%20the%20dependent%20logical%20files
<https://www.rpgpgm.com/2013/06/chgpf-theres-quirk-that-can-bite-your.html#:~:text=The%20Change%20Physical%20File%20(CHGPF)%20is%20a%20useful,the%20following:%20Delete%20all%20the%20dependent%20logical%20files>
.
-----Original Message-----
From: smith5646midrange@xxxxxxxxx <smith5646midrange@xxxxxxxxx>
Sent: Friday, January 22, 2021 1:43 PM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxxxxxxxx
Subject: RE: Converting large amount of data
CHGPF never entered my mind even though I do use it occasionally.
For the files being converted with CPYF, we are doing a *MAP *DROP.
Anything that could not be handled via *MAP *DROP (i.e. an alpha field
changing from 2A to 3A and needing a leading zero added) are being
converted
via a custom program.
Do you know that CHGPF is quicker than CPYF? I supposed that might depend
on how many fields are changing.
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Rob
Berendt
Sent: Friday, January 22, 2021 1:17 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Converting large amount of data
Good point. There are a number of people who never knew that many years
ago
IBM allowed you to do the following to modify and add columns.
CHGPF FILE(MYFILE) SRCFILE(MYLIB/QDDSSRC) They only remember the early
releases required you to copy from one file to another to modify/add
columns.
Rob Berendt
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of x y
Sent: Friday, January 22, 2021 1:06 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Converting large amount of data
CAUTION: This email originated from outside of the organization. Do not
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Copy data into PF's without logicals, SQL indexes, or constraints
(referential integrity and such).
In CPYF, use FROMRCD(1) and COMPRESS(*NO) to try to force the system to do
a
block copy. You mentioned "new format", so you'll probably use FMTOPT(*MAP
*DROP); don't use it unless you need to.
WRT "new format", remember you can change your DDS source (multiple columns
at once) and then execute CHGPF (including the DDS source file and member
names) and the system will change the format for you; it's the equivalent
of
SQL's ALTER TABLE. *My experience suggests the logicals are magically
maintained through this process; this can be a major time-saving benefit*.
So, if you need to add new columns, resize others, change the text, edit
codes, or column headings, CHGPF is the way to go. I've been midranging
since the days of the System/3 and using CHGPF to change the layout of a
file is IMO one of the top five enhancements ever.
On Fri, Jan 22, 2021 at 8:27 AM <smith5646midrange@xxxxxxxxx> wrote:
We have some files that are pretty big that we are going to beon.
converting to a new format and I'm looking for some info on converting
the data.
I am not looking for answers about splitting in threads or anything
like that. We are converting over 700 files so threads will not help me.
Threads will just delay other files from being converted.
That said, I have one specific question that I am looking for an
answer
list
Is it more efficient to
1. Create the new physical files and their logical files, and then
convert the data
or
2. Create the new physical files, convert the data, and then add the
logical files
I know the machine has 3 CPUs with the ability to pull 3 more from the
pool.
I forget the memory but it is a pretty decent amount
There are 12 I/O channels.
If there is something else you need to know to give me an answer,
please ask.
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