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Informix - Problem description

Problem IT30917 Status: Closed

SLOW-ALTERING A TABLE WHOSE INTERNAL SERIAL COUNTER WENT NEGATIVE WILL
RESET THE SERIAL COUNTER TO 1

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
A SERIAL column, once having reached its maximum value (2^31-1),
will restart from 1, with internal serial counter now being
negative - all working nicely as long as newly produced serial
values can be entered into the table, i.e. wouldn't conflict
with existing values in a unique index or constraint.
An ALTER TABLE should also leave all of this, including current
(next) serial value, unaffected, so inserting can proceed.

Should such ALTER TABLE be conducted as a 'slow alter', though,
the internal serial counter suddenly would be reset to 1,
potentially leading to unexpected insert conflicts.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC14 and 14.10.xC4.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 12.10.xC14 or 14.10.xC4 (when      *
* available).                                                  *
****************************************************************
Local Fix:
after such ALTER TABLE, or as soon as realizing you've got
negative internal serial counter, run another ALTER TABLE MODIFY
( SERIAL ());
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
12.11.2019
03.03.2020
03.03.2020
Problem solved at the following versions (IBM BugInfos)
12.10.xC14,
14.10.xC4
Problem solved according to the fixlist(s) of the following version(s)
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