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DB2 does not identify the tables as collocated even though they exist on the same set of db partitions because they reside in different database partition groups. The optimizer doesn't always make a good choice when comparing plans in DPF.
With the improvement to the block index access cost (introduced in the APAR IT00482 ) , our scenario/statement is exposed to errors in the cardinality estimates and a limitation in DPF plan comparison, as well.
For more details please see PMR 28374,070,724 and contact Mrs. Maria Jane from IBM Support.
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