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While researching a production issue in all our production systems with a remote DB2 program, we ran OQT in DSM and found that the QUERY ADVISOR was missing a very obvious and key SQL problem. A column that is defined with a CHAR datatype was being compared to a literal with NO Quotes that was all numerics. Although the Optimizer will convert it using a CAST function, it avoids the optimal use of an existing index that this column is a part of. We ended up finding it ourselves by looking at the formatted query that the tool created, but it should have showed up as a warning for us to review. I am attaching the full recommendation report that OQWT generated from our BOST production region. We are At DB2 V12 R100 . Running DSM Version 2.1 Release 22.214.171.124, Build 20190702_1507 . this is the solution that was sent to the developers (this recommendation resulted in a 99% reduction in CPU and I/O):
The SQL in APOIMP18 and APOIMP16 is listed below.
The SQLs in these programs have a WHERE clause coded: AND BATCH_PROC_D = 20191024 BATCH_PROC_D is a character column.
The SQL needs to be coded as AND BATCH_PROC_D = ‘20191024’ (put in quotes)
From IBM support: Looking for an enhancement to analyze the BEFORE stage query text to detect if there is a CAST function in one side and other side in predicate is a value, then show a warning in our Query Advisor recommendation.
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