PH64568: ABEND04E RC00C20305 AT DSNB1CPP OFFSET029A4 WHEN PB0 IS NOT ZERO

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During allocation of linear pageset pieces, Db2 received a
  MSGDSNB207I DYNAMIC ALLOCATION OF DATA SET FAILED. Db2 closed
  the dataset without freeing the Pb0's. Later Db2 extend
  attempted to create a new piece, open and preformat for one
  page and close the piece in order to get out of create mode. It
  subsquently abends with ABEND04E 00C20305 AT DSNB1CPP +029A4 due
  to non-zero Pb0 found for next piece.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Db2 12 and Db2 13 for z/OS users.        *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND04E RC00C20305 DSNB1CPP            *
  ****************************************************************
  * RECOMMENDATION: Apply corrective PTF when available          *
  ****************************************************************
  The PB0 storage of a pageset/partition will not be freed when
  the physical close is driven by an open failure, since other
  agents may be accessing it. The allocated PB0 will be reused
  in the event of a subsequent open request, or will be freed
  when the associated PB block is freed.
  
  For non-partitioned pageset, Db2 extends data sets when the
  requested space exceeds the remaining space in the data set.
  Db2 extend will attempt to create a new piece, open and
  preformat for one page and close the piece in order to get out
  of create mode. During the close processing of the piece, it
  will check if the PB0 of next piece exists. ABEND04E RC00C20305
  DSNB1CPP may occur unexpectedly if the PB0 of next piece was
  left unfreed due to an open failure as described above.
  

Problem conclusion

• Db2 code has been modified to avoid the ABEND04E-00C20305
  when the PB0 of next piece exists but next piece is not opened.
  

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:

  UI99983 UI99984

Modules/Macros

• DSNB1CPP
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI99983

     UP25/02/21 P F502

• RD10 PSY UI99984

     UP25/02/21 P F502

Fix is available

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