PM53943: ABEND04E RC00E20003 DSNXECT DSNSVBK +05EE STORAGE LEAK MAY OCCUR WHEN EXECUTING SELECT FROM UPDATE SQL STATEMENTS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND04E RC00E20003 DSNXECT DSNSVBK +05EE storage leak may occur
  when executing SELECT FROM UPDATE SQL statements
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 9 for z/OS and DB2 10 for z/OS users *
  *                 of SELECT FROM UPDATE sql statements.        *
  ****************************************************************
  * PROBLEM DESCRIPTION: A storage leak containing DB2 uproc     *
  *                      control blocks having an eyecatcher of  *
  *                      UZB can occur for long-running threads  *
  *                      that run SELECT FROM UPDATE sql         *
  *                      statements.  Once the storage pool is   *
  *                      exhausted, an ABEND04E rc00E20003 can   *
  *                      occur at location DSNGEPLC.DSNSVBK      *
  *                      +05EE or OFFSET05EE.                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Excessive storage growth occurs in the DB2 DBM1 address space
  for long-running threads that run SELECT FROM UPDATE sql
  statements.
  
  The storage growth (or storage leak) contains DB2 uproc control
  blocks that have an eyecatcher of UZB.  These can occur on
  behalf of long-running threads that run SELECT FROM UPDATE sql
  statements.  This can eventually lead to a local storage
  shortage in which the maximum storage for an agent local pool is
  exceeded.  The pool can then become unavailable for further
  storage allocation.  The UZB blocks remain resident because they
  are not properly freed at statement clean up time.  Once the
  storage pool is exhausted, an ABEND04E rc00E20003 can occur at
  location DSNGEPLC.DSNSVBK +05EE or OFFSET05EE.
  

Problem conclusion

• The code in DB2 has been modified to free the uproc control
  blocks (that have a UZB eyecatcher) that are created on behalf
  of SELECT FROM UPDATE statements. This will prevent the
  storage leak from occurring.
  
  Also, please note that this apar will require apar PM51933
  (v9 ptf UK74770, v10 ptf UK74769) to provide the complete
  solution.
  
  Additional Keywords: SQLSELWUPDATE DB2STGLK/K SQLSTORAGE
  

Temporary fix

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

Comments

APAR Information

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

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

  UK76200 UK76201

Modules/Macros

• DSNXGMRG DSNXGRTS
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK76200

     UP12/02/29 P F202

• R910 PSY UK76201

     UP12/02/29 P F202

Fix is available

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