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Competing products (Oracle Database, Microsoft SQL Server) provide the ability to configure query optimizer in a way that it considers using query parallelism only when query complexity exceeds the configured threshold.
DB2 lacks that capability, as does not have a similar configuration parameter. It is also not possible to configure the similar behavior with DB2 WLM, because it is currently not possible to create a WLM threshold with the REMAP action based on ESTIMATEDSQLCOST parameter.
DB2 optimizer definitely contains some logic to decide on using query parallelism, but this logic is currently not configurable.
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