PK21218: RSR SHADOW DB WAS CORRUPTED BY RECEIVING GAP DURING OFR

APAR status

• Closed as program error.

Error description

• The RSR shadow DB was corrupted by receiving gap during OFR.
  The UP2 in L2 gap was not applied by OFR.
  --------------------------------------------------------
            (L1)    (L2)
  A-ACT |---------|  GAP  |
             UP1     UP2      (L3)    (L4)
  B-ACT                     |-------|----------->
                               UP3     UP4
  TRK   |-/DBR----------------------------/STA-->
  --------------------------------------------------------
  L1-L4 are log data sets.  UP1-UP4 are update log records.
   1. /STA (OFR)
       => L1 and L3 were allocated
   2. Received L2 GAP
       => L2 and L4 were allocated
   3. DFS4056I DB STARTED
         => UP2 lost !!!
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V8 Remote Site Recovery ( RSR )      *
  *                 users may be affected.                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: RSR shadow DB corrupted by OFR when     *
  *                      there is a tail gap in one of the       *
  *                      required logs.                          *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  The RSR shadow DB was corrupted by receiving gap during OFR.
  The UP2 in L2 gap was not applied by OFR.
  --------------------------------------------------------
            (L1)    (L2)
  A-ACT |---------|  GAP  |
             UP1     UP2      (L3)    (L4)
  B-ACT                     |-------|----------->
                               UP3     UP4
  TRK   |-/DBR----------------------------/STA-->
  --------------------------------------------------------
  L1-L4 are log data sets.  UP1-UP4 are update log records.
   1. /STA (OFR)
       => L1 and L3 were allocated
   2. Received L2 GAP
       => L2 and L4 were allocated
   3. DFS4056I DB STARTED
       => UP2 lost
  

Problem conclusion

•  AIDS: RIDS/DBRC RIDS/UTL DBRC UTL
    DEP: NONE
    GEN:
  
  *** END IMS KEYWORDS ***
  DSPOFRLR has been changed to detect a tail gap in the set of
  logs required for OFR of any given database.  If there are DB
  changes (a later ALLOC) after the gap the DB will be stopped
  with,
       MSGDFS4108A START FOR DATABASE dbname FAILED:
                   04 MISSING LOG
  

Temporary fix

Comments

APAR Information

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

  PK20241

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

  UK13340

Modules/Macros

•    DSPOFRLR
  

Fix information

• Fixed component name

  IMS V8

• Fixed component ID

  5655C5600

Applicable component levels

• R800 PSY UK13340

     UP06/04/14 P F604