APAR status
Closed as program error.
Error description
An ALTER TABLE, when executed as an in-place alter (IPA), is the point in time where oldest in-place alter versions get cleaned up if there are no more rows for these versions. Such clean-up can be time and cpu consuming if there are many such old versions to remove and esp. some later versions in the IPA history involve large alters (e.g. multiple hundreds of columns added in one version). With fragmented tables this process had to occur for every fragment's IPA history, and while processing one partition, no other thread could be running on the current cpu vp. This is independent from any rows in such table and also has nothing to do with 'outstanding in-place alters' (rows still in old versions' schemas). No table data is being modified in this process.
Local fix
To anticipate and avoid this problem, find tables with very high (> couple thousands) sysmaster.sysptnhdr.pta_opems_filled values and rebuild them before their next ALTER TABLE.
Problem summary
**************************************************************** * USERS AFFECTED: * * Users of Informix Server prior to 12.10.xC15 and 14.10.xC5. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Informix Server 12.10.xC15 (when available) or * * 14.10.xC5. * ****************************************************************
Problem conclusion
Fixed in Informix Server 12.10.xC15 and 14.10.xC5.
Temporary fix
Comments
APAR Information
APAR number
IT31200
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
C10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-12-09
Closed date
2020-12-10
Last modified date
2020-12-10
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
[{"Line of Business":{"code":null,"label":null},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"C10"}]
Document Information
Modified date:
11 December 2020