DB2 FOR LUW / DB2FORLUW / A10 - DB2

A query with TABLESAMPLE SYSTEM() might hang if it runs in 
parallel mode, i.e. INTRA_PARALLEL = YES. 
 
This issue was observed with ADMIN_MOVE_TABLE function which 
might use such queries starting with DB2 v10.1 Fixpack 1 (see 
also APAR IC84414). 
 
You might see a query like the following when executed with sub 
agents to hang: 
 
SELECT ... 
FROM <table> TABLESAMPLE SYSTEM() WITH UR; 
 
A stack trace against the coordinating agent might show 
"sqkfChannel::WaitRecvReady" function waiting to receive data 
from sub agents: 
 
ossDumpStackTraceInternal 
ossDumpStackTrace 
OSSTrapFile::dumpEx 
sqlo_trce 
sqloDumpDiagInfoHandler 
semtimedop 
sqloWaitEDUWaitPost 
sqkfChannel::WaitRecvReady 
sqkfChannel 
sqlkqrcv 
sqlktrcv 
sqlkt_unpack_tuple 
sqlktftc 
sqlritqa 
sqlriSectInvoke 
sqlrr_process_fetch_request 
sqlrr_open 
sqljs_ddm_opnqry 
sqljsParseRdbAccessed 
... 
 
but in application snapshot there are no associated sub agents 
anymore.

**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 10.1 Fix Pack 3.                      * 
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Do not use INTRA_PARALLEL, or turn parallelism off for the 
query, i.e.: SET CURRENT DEGREE = '1'

DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
 

First fixed in DB2 Version 10.1 Fix Pack 3.

not known / see Local fix

forerunner  : APAR is sysrouted TO one or more of the following: IC95295 
follow-up : 

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

30.04.2013
27.09.2013
27.09.2013