PI12709: DB2 DOES NOT REUSE SPACE THAT HAS BEEN FREED BY ROWS THAT HAVE BEEN DELETED AND COMMITTED FOR A LONG TIME.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• It takes DB2 a long time to detect that deleted space can be
  reused, even though the delete is committed for a long time, and
  there are no active scrollable cursors. This causes the table
  space to grow and space search to take an unnecessary long time.
  ADDITIONAL SYMPTOMS:  INSERT PERFORMANCE DEGRADATION as
  available space is not reused.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: ALL V10 and V11 DB2 for z/OS users           *
  ****************************************************************
  * PROBLEM DESCRIPTION: Data page row IDs are not reused for    *
  *                      insert due to the presumed presence of  *
  *                      a scrollable cursor, even though there  *
  *                      are no scrollable cursors present.      *
  *                      This results in insert performance      *
  *                      degradation and unnecessary table       *
  *                      space growth.                           *
  *                      This situation can also occur when      *
  *                      an object shares a buffer pool with     *
  *                      another base table that contains        *
  *                      LOB columns in the Universal Table      *
  *                      space, LOB table space or aux index     *
  *                      table space.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DB2 does not reuse space because it is not sensitive to
  scrollable cursors' existence.
  ADDITIONAL SYMPTOMS: RC00C9009C 00C9009C
  

Problem conclusion

• DB2 code was changed to distinguish the existence of the
  scrollable cursor when determining row IDs reuse of the page.
  

Temporary fix

Comments

• ×**** PE15/06/22 FIX IN ERROR. SEE APAR PI43446  FOR DESCRIPTION
  

APAR Information

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

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

  UI28186 UI28187

Modules/Macros

•    DSNB1DCM DSNB1PCK DSNB1RLS DSNIDILS DSNIDLDU
  DSNIDLEO DSNIKDEF DSNIONX2 DSNIOST2 DSNIREPR DSNIRNXT DSNISGRT
  DSNISMRT DSNISRID
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UI28186

     UP15/06/19 P F506

• RB10 PSY UI28187

     UP15/06/19 P F506

Fix is available

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