× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Lots of reasons performance could be different, not the least of which is
the possibility that the file's been pulled off disk hard disk and is
sitting somewhere in single-level storage. I'd run this test at least 10
times in succession, alternating with/without RCAC, to tamp down system
workload and the other unseen factors that play havoc with performance
measurement. My development partition has 245 jobs running--a handful of
QINTER's, one user daemon, and a handful of

It seems that this feature is extremely useful in some very specific use
cases, primarily to protect financial and employee-confidential data, but
not the most effective for dealing with performance issues. Another
approach is to create a covered index/access path, where all the
fields/columns needed for a given query are included in the "logical".

On Thu, May 13, 2021 at 5:57 AM Jay Vaughn <jeffersonvaughn@xxxxxxxxx>
wrote:

Can anyone explain or even theorize when applying RCAC to a file, how it
boosts the read performance of the file under native i/o?

Example:

file containing 5M rows...
simple RPG pgm in for loop with reads...

without RCAC applied
elapsed time - 23s
processing time - 1.544

with RCAC applied (alter table theTable activate column access control)
elapsed time - 4s
processing time - 1.413

drastic change in elapsed time - small change in processing time.

There is also a smaller gain when using SQL but not as much as native i/o.

tia

Jay
--
This is the RPG programming on IBM i (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives
at https://archive.midrange.com/rpg400-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription related
questions.

Help support midrange.com by shopping at amazon.com with our affiliate
link: https://amazon.midrange.com


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.