PM18099: DFR ENHANCEMENT TO SUPPORT IMS V9 APAR PM14852, IMS V10 APAR APAR PM10126 AND IMS V11 APAR PM13669

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• IMS DEDB Fast Recovery enhancement to support IMS V9 APAR
  PM14852 (PTF is UK57639), IMS V10 APAR PM10126 (PTF is UK57387)
  and IMS V11 APAR PM13669 (PTF is UK57638).
  KEYWORDS: IMSV11TGT/K  IMSV10TGT/K IMSV12TGT/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS DEDB FAST RECOVERY Version 2         *
  *                 Release 2 (FMID=H1J2220) users in IMS V9,    *
  *                 V10 or V11.                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: This APAR is DFR version for IMS V9     *
  *                      APAR PM14852 (PTF is UK57639), IMS V10  *
  *                      APAR PM10126 (PTF is UK57387) and IMS   *
  *                      V11 APAR PM13669 (PTF is UK57638).      *
  *                      - PM14852, PM10126 and PM13669          *
  *                      A XRF IMS alternate system abended      *
  *                      while doing the emergency restart.      *
  *                      An 0C4 abend code was issued because it *
  *                      was trying to access a lower area       *
  *                      memory address space. This happened     *
  *                      because a X'25' log record got          *
  *                      processed before the X'4080' log record *
  *                      and after X'4001' log record at the     *
  *                      time of IMS was doing the emergency     *
  *                      restart. The restart system processed   *
  *                      the X'25' log record and then verified  *
  *                      the area's EEQE information in the log  *
  *                      record against the restart system.      *
  *                      Since X'25' got processed before        *
  *                      X'4080' record, the DEDB database block *
  *                      didn't get loaded.                      *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  - PM18099 for IMS DEDB Fast Recovery
  DFR loads or creates and initializes the IMS basic control
  blocks (DDIR and DMAC) after a FP checkpoint.
  Then DFR analyzes log records after the selected checkpoint and
  reconstructs the database control blocks and the CI update
  statuses to the state that they were at the time of IMS failure.
  A DEDB data CI is recovered by using an reconstructed image of
  the data CI in a DEDB buffer that is chained from a DMAC.
  Whenever a X'25'(FP) or a X'26'(FP) log record gets logged
  before a X'4080' log record and after a X'4001' log record, DFR
  cannot chain the DEDB buffer into the DMAC for the CI whose
  update image was logged in the X'26'(FP) log record.
  Then DFR loses a recovery of CIs of the DEDB area that have
  EEQEs at the time of IMS failure.
  

Problem conclusion

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

• The following modules have been modified.
  (x = 9, A and B)
  *
  DFRLFTCx - This module was changed so that DFR might bypass the
             process of X'25' and X'26' log records whenever a
             FP checkpoint is not processed.
             This is because an EEQE will get processed later by
             X'4025' and X'4026' log records.
             . When DFR is processing a X'4089' log record (END
               FP checkpoint), DFR set a FP checkpoint log loaded
               bit (RSCDCKP1) into a FP checkpoint log process
               flag (RSCDCKPF).
             . When the RSCDCKP1 bit is set to the RSCDCKPF flag
               which shows that the FP checkpoint is processed,
               DFR processes X'25' and X'26' log records.
  *
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UK58720

Modules/Macros

• DFRLFCTA DFRLFCTB DFRLFCT9
  

Fix information

• Fixed component name

  DEDB FAST RECOV

• Fixed component ID

  5655E3200

Applicable component levels

• R220 PSY UK58720

     UP10/07/13 P F007

Fix is available

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