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DB2 - Problem description

Problem IC77284 Status: Closed

CLI ASYNCHRONOUS EXECUTION MAY CAUSE POOR PERFORMANCE DUE TO 1 SEC DELAY.

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
A CLI based application might intermittently run slow if the 
application enables asynchronous execution. CLI applications can 
enable asynchronous execution by the code like as below: 
 
RC = SQLSetStmtAttr( hstmt, 
                     SQL_ATTR_ASYNC_ENABLE, 
                    (SQLPOINTER) SQL_ASYNC_ENABLE_ON, 
                     0); 
 
The db2trc shows the following 1 sec delay on the application 
thread when the application runs into this performance problem. 
 
40095   1.735732055   SQLExecute entry 
40130   1.735823966   | CLI_asyncRequest entry 
40133   1.735830950   | | sqloAppWaitOnSync entry 
40136   2.730424676   | | sqloAppWaitOnSync data [probe 20: 
WAIT_TIMEOUT] 
40137   2.730431102   | | sqloAppWaitOnSync exit
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Users who uses asynchronous execution on CLI based           * 
* applications.                                                * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* A CLI based application might intermittently run slow if the * 
* application enables asynchronous execution. CLI applications * 
* can enable asynchronous execution by the code like as below: * 
*                                                              * 
* RC = SQLSetStmtAttr( hstmt,                                  * 
*                     SQL_ATTR_ASYNC_ENABLE,                   * 
*                     (SQLPOINTER) SQL_ASYNC_ENABLE_ON,        * 
*                     0);                                      * 
*                                                              * 
* The db2trc shows the following 1 sec delay on the            * 
* application thread when the application runs into this       * 
* performance problem.                                         * 
*                                                              * 
* 40095  1.735732055  SQLExecute entry                         * 
* 40130  1.735823966  | CLI_asyncRequest entry                 * 
* 40133  1.735830950  | | sqloAppWaitOnSync entry              * 
* 40136  2.730424676  | | sqloAppWaitOnSync data [probe        * 
* 20:WAIT_TIMEOUT]                                             * 
* 40137  2.730431102  | | sqloAppWaitOnSync exit               * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Please upgrade to DB2 V9.5 FixPack 9 or later, then set      * 
* patch2=112 in db2cli.ini.                                    * 
****************************************************************
Local Fix:
Users can bypass this issue by disabling asynchronous execution. 
Please implement one of the followings: 
a) Turn SQL_ATTR_ASYNC_ENABLE off in the application code. 
b) Set ASYNCENABLE=0 in db2cli.ini 
c) Set DisableAsyncQueryExecution as 1 in db2dsdriver.cfg.
available fix packs:
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
This problem was first fixed in DB2 V9.5 FixPack 9.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC77950 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
30.06.2011
12.03.2012
12.03.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.9 FixList
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