APAR status
Closed as program error.
Error description
Optimizer underestimates cost of the sort operation for wide result sets. As a result, the wrong execution plan is used: sequential scan and sort, instead of index path.
Local fix
Force index path with +INDEX optimizer directive
Problem summary
**************************************************************** * USERS AFFECTED: * * some order by/group by query might use sequential scan * * instead of index scan * **************************************************************** * PROBLEM DESCRIPTION: * * Slow performance might be seen by customer. * **************************************************************** * RECOMMENDATION: * * Upgrade to 11.50.xC10 when available. * ****************************************************************
Problem conclusion
Fixed in 11.50.xC10.
Temporary fix
Comments
APAR Information
APAR number
IC77195
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
B50
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2011-06-28
Closed date
2017-06-15
Last modified date
2017-06-15
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
RA10 PSN
UP
RA10 PSY
UP
RB10 PSN
UP
RB10 PSY
UP
RB50 PSN
UP
RB50 PSY
UP
RB70 PSN
UP
RB70 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"B50","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
15 June 2017