IT01840: WITH NON-ZERO PDQPRIORITY OPTIMIZER ASSIGNS LOWER COST TO SEQUENTIAL SCAN WHILE INDEX PATH IS FASTER

APAR status

• Closed as program error.

Error description

• You are running Informix with OPTCOMPIND set to 2. You noticed
  that a simple query against a fragmented table takes more time
  if PDQ is enabled. You checked the query plans and found that
  the Informix optimizer assigns lower cost to a plan with
  sequential scan (PDQ enabled) while the plan used without PDQ
  uses index path, takes less time but costs more.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of 11.70.xC3 through 11.70.xC8.                        *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IDS-11.70.xC9                                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IDS-11.70.xC9
  

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