Most likely cause is SYSZTIOT or SYSZVVDS contention -- so the abend 91A are symptoms of that latent problem (which affects your SLA potentially). Catalog added contention management enhancement in z/OS 1.12 which causes abend 91A for excessive wait and when the wait time threshold is reached the abend "resolves" the serialization. Whether trivial or significant having hundreds per day depends on your specific configuration, but worthy of analysis. Lots of possible causes, particularly for DB2, so pointless to speculate further.
On Fri, Jun 16, 2017 at 4:43 PM, Peter Hunkeler <[email protected]> wrote: > > >Catalog processing is not my area of expertise, but I think that this > symptom record is the result of a catalog service task being ABTERMed with > code 91A, possibly by a catalog analysis task. I don't remember offhand if > a 91A is also used to terminate a service task when the suspended requesting > task gets ABTERMed. > > > > > So this seems to be part of some CATALOG health checking and recovery > processing. A good thing, basically, but if you have hundreds of those a > day, it may indicate some latent problem. Somewhere in your system setup, > or in some software calling CATALOG services, or even in CATALOG itself. > > > As Jim suggested, you may want to take one or a few dumps and try to find > out why you see so many of them. DAE will suppress duplicate dumps, i.e. > dumps where the symptoms (symptom string) indicate it is likely for the > same cause. You might want to change the SLIP to ACTION=NOSUP,MATCHLIM=5 so > that DAE will not suppress duplicates, until the number of dumps you want > has been taken (MATCHLIM=n). Without the MATCHLIM, each occurrence you > initate a dump being taken, which could kill your preformance. > > > -- > Peter Hunkeler > > > > > -- > Peter Hunkeler > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
