IT27997: BFCHECK BAD PAGE PG_FRPTR <SIZE> < SIZEOF(IFX_PAGE_T) 24 OR > SLOTBEG <SIZE> WHEN UPDATING PAGE WITH OUTSTANDING IN PLACE ALTERS

APAR status

• Closed as program error.

Error description

• Table is created in a 4K page dbspace.  It has a 1 single data
  page in use with 59 rows on it.  It is then altered by 7 alter
  table statements that add 4 columns (1 int, and 3 varchars, and
  then reduces the size of the 3 varchars that were just added).
  
  At that point an update statement is run that modifies just 1
  row on the page.  The server appears to think it can leave all
  the rows on the same page, and ends up writing into the slot
  table (because there isn't enough free space on the page to
  accommodate the increased row size for all 59 rows).
  
  The server assert fails trying to write the page out (so it's
  caught in the bfcheck that bfput is doing) but the changes get
  logged, so when the server crashes, it attempts to do the same
  thing in recovery and fails again, so the server can't be
  brought online.
  
  The stack trace in the failure:
  
  afstack
  afhandler
  affail_interface
  bffail
  buffput
  ckpgversion  (may not see this frame, was present on solaris,
  not present on linux)
  rewrecord
  rsrewrec
  fmrewrec
  aud_sqisrewrec
  doupdate
  chkrowcons
  dodmlrow
  dodelupd
  excommand
  sq_execute
  sqmain
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of IDS prior to 12.10.xC13.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Bfcheck bad page pg_frptr <size> < sizeof(ifx_page_t) 24 or  *
  * > slotbeg <size> when updating page with outstanding in      *
  * place alters.                                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Fixed in IDS 12.10.xC13.
  

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:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels