Re: Partial record update - any performance advantage?

It almost certainly performs better - but whether it is a significant enough difference to measure is another matter.

Simply put, when you do any I/O operation RPG moves each field from/to the buffer. If you have a record with 1,000 fields then moving 3 vs 1,000 may be noticeable. I moving only 3 out of 6 you'll not see any measurable difference.

But as others have said that is NOT the reason to use it. Safety and documentation are the real reasons.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On Jun 13, 2019, at 5:24 PM, Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

Thanks everyone. The advantages of partial updates are understood, but
someone claimed that it gives a better performance, hence I just wanted to
either verify or debunk that statement.

On Thu, Jun 13, 2019 at 2:53 PM Booth Martin <booth@xxxxxxxxxxxx> wrote:

Performance isn't the real issue, imho. Its more about updating &
record locks. If someone else is in there changing f5 through f100
while your user is updating f1 through f4 then that other user is going
to be scratching her/his head as to why update don't work. And the
other way around, too.

On 6/13/2019 8:18 AM, Vinay Gavankar wrote:

Hi,

If I have a table with 100 fields, when updating only 4 fields, is there
any performance advantage of using

update rcdfmt %fields(f1, f2, f3, f4);
vs.
update rcdfmt;

Is the advantage (or absence) documented anywhere (need to show my

bosses)

Thanks
Vinay

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