Fixes are available
APAR status
Closed as fixed if next.
Error description
Starting with v11.1m1fp2 the BCD DECIMAL division algorithm got replaced on AIX by an implementation based on decimal floating point instructions available on Power6 and above. This has made the row based DECIMAL division much faster. As a side effect users might experience an increased accuracy. This change now introduces a new and faster BCD DECIMAL division implementation for the other platforms that provides increased accuracy for the other platforms. Without the change on non-AIX db2 "values(Decimal('9056550.000',19,3)/Decimal('20125666.660',19,3) )" will return 0.450000000000 while the expected result is 0.450000000149. In most cases this tiny difference does not play a role as the result typically gets written back to DECIMAL(19,3) and then the difference in the last digits get truncated. To return to the old DECIMAL division implementation, use: db2set DB2_RUNTIME_DEBUG_FLAGS=DECIMAL_DIVIDE_COMPAT
Local fix
Perform division using DECFLOAT data type.
Problem summary
**************************************************************** * USERS AFFECTED: * * non-AIX or <= Db2 v11.1 m1fp2 or not Power6 * * row based division with large scale * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to next fixpack. * ****************************************************************
Problem conclusion
Temporary fix
Comments
APAR Information
APAR number
IT34049
Reported component name
DB2 FOR LUW
Reported component ID
DB2FORLUW
Reported release
B10
Status
CLOSED FIN
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-08-30
Closed date
2021-02-23
Last modified date
2021-02-23
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Applicable component levels
RB10 PSN
UP
RB10 PSY
UP
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
03 May 2022