PI26452: UNLOAD UTILITY SPANNED YES ON LOB TABLESPACE LOOPING IN DSNUULMB.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An UNLOAD of a LOB tablespace with SPANNED YES got into a loop
  and never ends.
  The Unload dataset is on tape but the problem also happens
  using vtape.
  At the time of the dump the job is still positioned on first
  tape volume but appears not to write anything.
  Console dump analysis showed the loop being in DSNUULMB between
  offsets +ABA and +CF6 (level UK94806). It looks an internal
  variable went negative when blksize is greater than 32767 .
  

Local fix

• Manually specify a BLKSIZE less than 32K for the unload
  dataset (or disable LBI Large Block Interface for datasets) .
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 10 for z/OS and DB2 11 for z/OS      *
  *                 users of the UNLOAD utility with SPANNED     *
  *                 YES and SYSREC on TAPE utilizing Large       *
  *                 Block Interface (LBI).                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Endless loop during an UNLOAD utility   *
  *                      with SPANNED YES and the unload         *
  *                      (SYSREC) data set is on TAPE and        *
  *                      using Large Block Interface (LBI).      *
  ****************************************************************
  * RECOMMENDATION: Apply corrective PTF when available          *
  ****************************************************************
  An UNLOAD SPANNED YES utility of a LOB table space went into an
  endless loop and had to be cancelled.  The unload SYSREC data
  set was on TAPE and TAPEBLKSZLIM=65535 was set in SYS1.PARMLIB
  to utilize LBI.  UNLOAD SPANNED YES does not support the Large
  Block Interface and will now ignore a block size that is greater
  than 32 KB.
  

Problem conclusion

• UNLOAD SPANNED YES utility code has been modified to ignore the
  Large Block Interface for the SYSREC data set on TAPE.  The
  data set will utilize system determined blocksize (SDB) and
  the records will continue to be written in the variable blocked
  spanned format.
  
  The Utility Guide and Reference manual has been updated to
  document that UNLOAD SPANNED YES ignores the Large Block
  Interface.  It will be added to the following sections:
  
  Data sets that online utilities use
  UNLOAD utility under the SPANNED keyword
  UNLOAD utility under Unloading data in spanned record format
  

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:

  UI24205 UI24206

Modules/Macros

•    DSNUGSDA DSNUULDB
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UI24205

     UP15/01/21 P F501

• RB10 PSY UI24206

     UP15/01/21 P F501

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.