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DB2 - Problem description

Problem IC64843 Status: Closed

INSTANCE MAY ABEND COMPILING A QUERY IN EVALUATE INDEXES EXPLAIN MODE OR
RUNNING DB2ADVIS FOR INDEX RECOMMENDATIONS (-M I)

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
Compiling a query under EXPLAIN MODE EVALUATE INDEXES or running 
the DB2 Design Advisor (db2advis) under index recommendation 
mode, i.e., with the -m I command-line option, may cause the 
instance to abend. 
 
The conditions required for such an abend are: 
- More than 1 predicate present in a query being evaluated 
  either under the EVALUATE INDEXES EXPLAIN MODE or as part of 
  the input workload for db2advis 
- Index candidates in the ADVISE_INDEX table either (1) refer to 
  columns that are not part of the table for which they are 
  candidates or (2) refer to the same column more than once. 
  This can occur either by user error or if the table in 
  question was ALTERed.
Problem Summary:
Compiling a query under EXPLAIN MODE EVALUATE INDEXES or running 
the DB2 Design Advisor (db2advis) under index recommendation 
mode, i.e., with the -m I command-line option, may cause the 
instance to abend. 
 
The conditions required for such an abend are: 
- More than 1 predicate present in a query being evaluated 
either under the EVALUATE INDEXES EXPLAIN MODE or as part of 
the input workload for db2advis 
- Index candidates in the ADVISE_INDEX table either (1) refer to 
columns that are not part of the table for which they are 
candidates or (2) refer to the same column more than once. 
This can occur either by user error or if the table in 
question was ALTERed.
Local Fix:
- Avoid ALTERing any tables during invocations of db2advis 
- Ensure that any evaluation-candidate indexes populated into 
  the ADVISE_INDEX table are in valid form
available fix packs:
DB2 Version 9.1 Fix Pack 9  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 10  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows

Solution
Problem was first fixed in Version 9.1 Fix Pack 9.
Workaround
- Avoid ALTERing any tables during invocations of db2advis 
- Ensure that any evaluation-candidate indexes populated into 
the ADVISE_INDEX table are in valid form
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
27.11.2009
13.04.2010
13.04.2010
Problem solved at the following versions (IBM BugInfos)
9.1.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.9 FixList
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