IMS Pre-load Validation - Performance Tuning

yogi.47eie · New User Joined: 16 Aug 2006 Posts: 45 Location: india

Hi Team,
Have you done Pre-loading of IMS Loads as part of performance tuning .If yes ,could you please advice various verification methods to make sure whether concerned IMS program is pre-loaded into main memory or not.

Thanks
Yogi

Rohit Umarjikar · Posted: Mon Oct 27, 2014 8:28 pm

Do you want to check TSO ISRDDN LOAD <Program Name>. ?

Also if you haven't chekd this Redbook then you may wants to take a look.

www.redbooks.ibm.com/redbooks/pdfs/sg247324.pdf

yogi.47eie · New User Joined: 16 Aug 2006 Posts: 45 Location: india

Thanks Rohit,
Now I got it..

1.TSO ISRDDN LOAD <Program Name>.
2.From the manual - " You specify the names of the modules to be loaded in member DFSMPLxx of IMS.PROCLIB."

I have gone through the redbook manual but some how missed the above the said statements.

Thanks for your prompt reply...

Thanks
Yogi

Ed Goodman · Active Member Joined: 08 Jun 2011 Posts: 556 Location: USA

I know the DBA group here uses the automatic memory manager built into IMS. The system will keep track of the most used programs and keep them loaded.

The tuning they do is to adjust the parameters of how many can be pre-loaded, how long they'll stay loaded, and how often they get called before staying loaded.

They also load two of our databases to memory because they are read only and referenced in every program.

yogi.47eie · New User Joined: 16 Aug 2006 Posts: 45 Location: india

Thanks Ed..
Thats an additional information for me.
I will have a check with my IMS DBA s as well about Automatic Memory Management configuration in our shop.

Thanks
Yogi