IT35860: forest of trees index becomes degraded following an in-place alter against columns which are not part of the index

APAR status

• Closed as program error.

Error description

• If an in-place alter is performed on a table which does not
  affect the columns of a forest of trees (FOT) index it would be
  expected that the index is unchanged. However the index
  partition key descriptor will be modified in a manner such that
  it is regarded as a regular index and not a FOT type. For unique
  indexes this may allow rows with duplicate key values to be
  inserted. Furthermore queries making use of this index may not
  return all of the correct rows.
  
  The oncheck -cI command may only report an error when duplicate
  values exist in a unique index.
  

Local fix

• Drop and recreate the FOT index. This action shall also be
  required following update to a version of Informix with a fix
  for this APAR.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Informix Server prior to 12.10.xC14 and 14.10.xC4.  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Informix Server 12.10.xC14 or 14.10.xC4.          *
  ****************************************************************
  Drop and recreate the FOT index. This action is required
  following update to a version with a fix for this APAR.
  

Problem conclusion

• Fixed in Informix Server 12.10.xC14 and 14.10.xC4.
  

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