Collecting data about DBRC-related problems

DBRC related problems can cause a variety of symptoms, including waits and loops. If you need to create the problem again, copies of the RECON listing, before and after the problem occurred, are most useful.

To diagnose a DBRC related problem, you need the following information:

  • A listing of the DBRC RECON data sets for the time that is as close as possible to the time of the failure.
    • Use the DBRC LIST.RECON command to obtain the listing.
  • A subsystem listing if you cannot obtain a RECON listing because of its size.
    • Use the DBRC LIST.SUBSYS ALL command to obtain a subsystem listing.
  • If recreates are possible, obtain the before and after copies of the RECON data sets.
  • Use the D GRS,CONTENTION command on each system that shares the RECON data set to determine if the data set is held at the exclusion of other waiters. If so, dump the owning address space by issuing the following command: 
    DUMP COMM=(dump title)
R nn,JOBNAME=(j1),SDATA=(CSA,PSA,RGN,SQA,SUM,TRT,GRSQ),END