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MA41448 - LIC-DB-OTHER-SRCB6005121 A SQL QUERY WITH A HIGH VOLUME OF
SUBSTR SCALAR FUNCTIONS MAY RESULT IN SYSTEM CRASH SRCB6005121

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-DB-OTHER-SRCB6005121 A SQL QUERY WITH A HIGH VOLUME OF
SUBSTR SCALAR FUNCTIONS MAY RESULT IN SYSTEM CRASH SRCB6005121

Error Description

System crashed recursing DbpmBinaryPatternMatchOperation for a  
SQL Query with a high volume of SUBSTR scalar functions        

Problem Summary

System crashed since too many DbpmSubstringOperation filled and
eventually overflowed the stack.  An SQL Query with a high      
volume of SUBSTR scalar functions could cause this type of      
problem and crash the system.                                  

Problem Conclusion

There is an SQE query that has tons of attribute operations (AO)
called back to back performing substring functions.  The calls  
were not foliating, so the stack would grow until it overflowed
and took the system down.  Fix was made to the AOs to make the  
calls foliate (meaning no room was taken on stack) so the stack
does not overflow and crash the system.                        

Temporary Fix

Comments

Circumvention


PTFs Available

R540 MF54236 PTF Cover Letter   2094
 R545 MF54238 PTF Cover Letter   2094
 R610 MF54241 PTF Cover Letter   2122
 R611 MF54243 PTF Cover Letter   2122
 R710 MF54290 PTF Cover Letter   2115

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 9400DG3DB
Failing Module.......................... RCHMGR
Reported Release................... R610
Duplicate Of..............................




System i Support

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Document Information

Modified date:
28 October 2013

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