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VSAM RLS Wait time


IBM Mainframe Forums -> JCL & VSAM
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blayek

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Joined: 04 Nov 2016
Posts: 5
Location: USA

PostPosted: Mon Oct 02, 2017 9:05 pm
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Hi, I am working on a project where we need to replace all the VSAM and IAM files to VSAM RLS for better higher availability. But while converting the IAMRLS files to VSAM RLS, we are not getting the performance we are expecting. While triggering a transaction to delete all old records from a file it's taking way longer than IAM RLS. While analyzing the Omegamon report I can see below are taking more time :

 Journal(MVS Logger) I/O wait Time --- 54% 
RLS Wait Time ---- 45% 

These two are consuming almost 90% of total execution time. Any guidance on how to reduce this time would be highly appreciated. Thank you very much.
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John Gay

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Joined: 10 Apr 2017
Posts: 1
Location: United States

PostPosted: Tue Oct 03, 2017 3:22 am
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Maybe due to IAM not being a true VSAM file?
Check out the IAM manual, I believe IAM has it's own RLS.

G/L
John
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Nic Clouston

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Joined: 10 May 2007
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Location: Hampshire, UK

PostPosted: Wed Oct 04, 2017 4:32 pm
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No reference to CICS - moving to JCL & VSAM
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Pete Wilson

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Joined: 31 Dec 2009
Posts: 541
Location: London

PostPosted: Sat Jun 09, 2018 11:08 pm
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Maybe your Coupling Facility Structure isn't large enough if it wasn't resized to cater for all the extra RLS datasets
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