PH14205: DSNI014I DSNIOW ERQUAL:5005 ABEND INVOLVING OVERFLOW RECORD

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Message DSNI014I DSNIOW ERQUAL 5005 REASON 00C90101 ABEND,
  during SQL query and accessing a Pointer/Overflow row.
  Db2 LOG data shows that the page which the Overflow row
  was on, underwent page compaction.
  
  ABEND04E
  MSGDSNI014I
  RC00C90101
  ERQUAL5005
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Db2 for z/OS users with overflow         *
  *                 records.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND04E RC00C90101                     *
  *                      LOC=DSNIDM.DSNIOW ERQUAL5005            *
  ****************************************************************
  * RECOMMENDATION: Apply corrective PTF when available.         *
  ****************************************************************
  A rare timing window exists when the page compaction operation
  is running concurrently with an uncommitted reader(UR). When UR
  reads an overflow page to locate and decompress an overflow
  record, Db2 detects that the overflow page has changed since its
  last access. It is necessary for Db2 to release the resources
  held on the overflow page before redriving some logic to process
  the overflow page again. Db2 hits the rare timing window when
  accessing the overflow record which happens to be relocated by
  the page compaction operation. Db2 is unsuccessful in releasing
  the held resources and causing an abend during redrive.
  

Problem conclusion

• Db2 has been fixed to use a local variable for releasing
  resources held on the overflow page. This way, an uncommitted
  reader's processing does not get impacted by the concurrent
  page compaction operation.
  

Temporary fix

Comments

APAR Information

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

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

  UI64639 UI64643

Modules/Macros

•    DSNIRSET
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RB10 PSY UI64643

     UP19/08/23 P F908

• RC10 PSY UI64639

     UP19/08/22 P F908

Fix is available

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