There is currently an open APAR with GDGe causing catalog performance
problems...here is a partial listing of the apar.
OA50703
APAR Identifier ...... OA50703 Last Changed ........ 16/12/12
PERFORMANCE ISSUE WITH GFL REQUESTS THAT INCLUDE GDGS AT 2.2
Symptom ...... PR PERFM Status ........... OPEN
Severity ................... 2 Date Closed .........
Component .......... 5695DF105 Duplicate of ........
Reported Release ......... 220 Fixed Release ............
Component Name ICF CATALOG & I Special Notice
Current Target Date ..17/02/28 Flags
SCP ...................
Platform ............
Status Detail: DESIGN/CODE - APAR solution is being designed
and coded.
PE PTF List:
PTF List:
Parent APAR:
Child APAR list:
ERROR DESCRIPTION:
Release 2.2 introduced GDG Extended (GDGE) functionality, which
allowed for GDG bases that included more than 255 GDSs. The GFL
code path was modified in such a way that when there is a GET
for catalog entries for GDS's, the code path re-gets the GDG
base every time a GDS is read. This applies to both regular
GDGs and GDGEs. This requires more I/O, which leads to a
noticeable performance impact.
_________________________________________________________________
Dave Jousma
Manager Mainframe Engineering, Assistant Vice President
david.jou...@53.com
1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H
p 616.653.8429
f 616.653.2717
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Allan Staller
Sent: Tuesday, December 20, 2016 3:59 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Using Extended Format as default
I can't think of any reason you should not, but allow for exceptions due to
broken (usually home grown) code that has some unforeseen dependencies.
PDS/PDSE and SORTWK(?) have some known restrictions.
There might be a few other areas with restrictions, but in general, I think
you'll do well.
HTH,
<snip>
Is there any compelling reason why I should not (or can't) use Extended Format
for all SMS managed Sequential (flat and GDG) and VSAM (KSDS, ESDS, Linear)
datasets?
Anything special I would need to do for Linear DB2 databases/tablespaces?
</snip>
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