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Informix - Problem description

Problem IT38574 Status: Closed

USCOLDIST MIGHT NOT YIELD WHICH CAN CAUSE SESSIONS TO HANG WHEN UPDATE
STATISTICS HIGH (COL) IS RUN.

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
The customer has a busy system where all users are running with
a shared memory connection.

There is a need to run update statistics medium / high on some
columns which are not part of any associated indexes.

Reviewing procstack for the running thread shows we are
constantly within usbldist->uscoldist during the delay / hang.

The hung sessions are able to run again after the update
statistics completes.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC16 and 14.10.xC7.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC16 or 14.10.xC7.          *
****************************************************************
Local Fix:
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC16 and 14.10.xC7.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC16 or 14.10.xC7.          *
****************************************************************
Comment
Fixed in Informix Server 12.10.xC16 and 14.10.xC7.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
01.10.2021
02.05.2023
02.05.2023
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)