DB2 FOR LUW / DB2FORLUW / B10 - DB2

A column based query may hang if it meets the following
conditions:

1. Containing aggregation functions such as group by, SUM etc.

2. Data exceptions may occur for aggregation functions e.g SUM
in the query has exceeded a data type limit (for example hitting
the maximum integer size)

During the hang period in db2pd -latch output, there are
manylatch waiters waiting on
SQLO_LT_ibm_cde__query__GroupByControlBlock__mErrorAndWarningMut
ex latch, but there is no latch holder.

In db2diag.log, the similar messages may be observed.

2014-01-23-23.01.03.231194+480 E9934361A458         LEVEL:
Severe
PID     : 13172852             TID : 388027         PROC :
db2sysc 0
INSTANCE: db2inst1             NODE : 000 HOSTNAME: host1
EDUID   : 388027               EDUNAME: db2agent (idle) 0
FUNCTION: DB2 UDB, oper system services,
sqloDumpLatchTableToLog, probe:10
DATA #1 : String, 102 bytes
Latch leaked on EDU termination: File GroupByControlBlock.hpp :
Line 2648 (Identity: 914) HoldCount: 1

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* USERS AFFECTED:                                              *
* ALL                                                          *
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* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
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* RECOMMENDATION:                                              *
* Upgrade to Db2 11.1 Mod 4 Fixpack 4 or higher                *
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not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

08.06.2018
27.11.2018
27.11.2018