Re: [EXTERNAL] native i/o and RCAC - performance

aware of just about every link out there on rcac - thanks Alan...

looking for an "under the covers" explanation of how it works with DB2 and
why the performance gains.... if anyone knows or cares to theorize.

thanks!

Jay

On Thu, May 13, 2021 at 9:03 AM Alan Shore via RPG400-L <
rpg400-l@xxxxxxxxxxxxxxxxxx> wrote:

Just found this web page

https://www.mcpressonline.com/security/ibm-i-os400-i5os/an-introduction-to-ibm-is-row-and-column-access-control-rcac

Alan Shore
Solutions Architect
IT Supply Chain Execution

[cid:image001.png@01D747D6.C0E2C720]

60 Orville Drive
Bohemia, NY 11716
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
E-mail : ASHORE@xxxxxxxxxxxxxxxxxxxx

'If you're going through hell, keep going.'
Winston Churchill

From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of
Jay Vaughn
Sent: Thursday, May 13, 2021 9:00 AM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: [EXTERNAL] native i/o and RCAC - performance

row column access control

introduced to IBM os in 7.2

Jay

On Thu, May 13, 2021 at 8:59 AM Alan Shore via RPG400-L <
rpg400-l@xxxxxxxxxxxxxxxxxx<mailto:rpg400-l@xxxxxxxxxxxxxxxxxx>> wrote:

What is RCAC?

Alan Shore
Solutions Architect
IT Supply Chain Execution

[cid:image001.png@01D747D6.4D55A1B0]

60 Orville Drive
Bohemia, NY 11716
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
E-mail : ASHORE@xxxxxxxxxxxxxxxxxxxx<mailto:ASHORE@xxxxxxxxxxxxxxxxxxxx>

'If you're going through hell, keep going.'
Winston Churchill

From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of
Jay Vaughn
Sent: Thursday, May 13, 2021 8:56 AM
To: RPG programming on the IBM i (AS/400 and iSeries) <
rpg400-l@xxxxxxxxxxxxxxxxxx<mailto:rpg400-l@xxxxxxxxxxxxxxxxxx>>
Subject: [EXTERNAL] native i/o and RCAC - performance

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
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