Re: Accessing Database vs Dataarea

I'm surprised that the difference is that big, but not that surprised that it is slower.

The database has been reworked many times over the years and made more and more efficient. I suspect that data areas have not really changed. Chuck Pence may have a better idea but it seems to me that there was not the pressing need to improve their performance compared with the database.

If you really wanted to improve performance then a User Space and pointer approach would be the fastest option I suspect because after the pointer resolution is is just regular memory access.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On Apr 21, 2017, at 5:42 PM, Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

Hi,

We have a program where same record of a 'control' file (input mode) is
being read for every iteration, and I thought that replacing the 'Chain'
with reading a dataarea.

So I ran a simple test to compare the time taken to read one record in file
100,000 times and reading a data area 100,000 times with 'IN' statement.

I was surprised that the file was read under 1 sec, whereas dataarea took
around 4-5 seconds.

Just to make sure, I looped for a million times. The file came in at 4
seconds and dataarea at 47 seconds.

I was wondering whether I am missing something or accessing a dataarea with
an 'IN' statement takes that long compared to file read.
--
This is the RPG programming on the IBM i (AS/400 and iSeries) (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/rpg400-l.

Please contact support@xxxxxxxxxxxx for any subscription related questions.

Help support midrange.com by shopping at amazon.com with our affiliate link: http://amzn.to/2dEadiD