PK66856: IMS DEDB FAST RECOVERY ENHANCEMENT IN SUPPORT OF IMS V10 APAR PK56321

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• IMS DEDB Fast Recovery ( DFR ) enhancement in support of IMS V10
  APAR PK56321 (PTF is UK35862).
  KEYWORDS: IMSV10TGT/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS DEDB FAST RECOVERY Version 2         *
  *                 Release 2 (FMID=H1J2220) users who use IMS   *
  *                 V10.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: This APAR is DFR version for IMS V10    *
  *                      APAR PK56321 (PTF is UK35862).          *
  *                      - PK56321                               *
  *                      New function provides non-recoverable   *
  *                      SDEP support.                           *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  - PK66856 for IMS DEDB Fast Recovery
  New function adds supporting DEDBs that use SDEPs to be
  registered as non-recoverable.
  DFR handles an non-recoverable DEDB with SDEPs and an
  non-recoverable DEDB with no SDEPs equivalently.
  If an area has been updated and the update is compromised,
  DFR marks "Recovery Needed" on DBRC. And DFR shows "RCVNEED
  (NONRCV)" on a "STATUS" column of a DEDB AREA STATUS LIST.
  

Problem conclusion

Temporary fix

Comments

• The following modules have been modified.
  *
  DFRLFCKA - This module was changed so that SDEP CI-RBA in
             X'4086' log record (DEDB buffer checkpoint) might be
             saved into DMACCRBA.
  DFRLFCTA - Add code to process X'5954' and X'5955' log records.
  DFRL595A - This module was changed so that SDEP CI-RBA in
             X'5954' and X'5955' log records might be saved into
             DMACCRBA, and SDEP CI-RBA in X'5958' log record
             might be compared with DMACCRBA in order to reset
             DMACCRBA.
  DFRNFCTA - This module was changed so that the integrity of the
             non-recoverable AREA with SDEPs might be verified.
  *
  ========================
  = DOCUMENTATION CHANGE =
  ========================
  IMS DEDB Fast Recovery for z/OS Version 2 Release 2 User's Guide
  and Reference (Document Number: SC27-0928-03) should be changed
  as follows.
  ================================================================
  Appendix A. Program functions
   A.5 First log processing
    A.5.5 Reconstructing the data CI update status
     DFR reconstructs the data CI update status by using the log
     records after the selected checkpoint.
  
  |  The following log records contain the update image or the
  |  update information for the data CIs:
  
      X'4026'
          ...
      X'4086'
          ...
      X'4086'
          ...
      X'5950'
          ...
      X'5951'
          ...
  |   X'5954'
  |       First SDEP buffer open log record
  |   X'5955'
  |       Next SDEP buffer open log record
      X'26'
          ...
  
  |  For these log records, except X'5950', X'5951', X'5954',
  |  X'5955', and X'4086' (DEDB buffer checkpoint), the update
     images of the data CIs on them are determined to be written
     into DEDB areas if no related I/O completion log records
     exist, because they have the update images for the committed
     transaction.
         :
     The X'5951' log record means there are some CI updates for a
     nonrecoverable DEDB area.
  |  The X'5954', X'5955', and X'4086' log records mean there are
  |  some sequential dependent segments in a buffer.
  |  DFR uses the X'5954', X'5955', and X'4086' log records for a
  |  nonrecoverable DEDB area in order to get the update
  |  information.
     DFR uses the log record with the succeeding X'5958' and
     X'5612' log record to determine whether any CI updates for
     the nonrecoverable DEDB area are compromised.
         :
  *
  

APAR Information

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

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

  UK37044

Modules/Macros

• DFRLFCKA DFRLFCTA DFRL595A DFRNFCTA
  

Fix information

• Fixed component name

  DEDB FAST RECOV

• Fixed component ID

  5655E3200

Applicable component levels

• R220 PSY UK37044

     UP08/06/05 P F806

Fix is available

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