The database server can allocate multiple threads to work in parallel on a single query. This feature is known as parallel database query (PDQ).
PDQ can improve performance dramatically when the database server processes queries that DSS applications initiate. PDQ lets the database server distribute the work for one aspect of a query among several processors.
For information on how to implement PDQ and how parallelization can enhance performance, see your IBM Informix Performance Guide. For information on the SET PDQPRIORITY environment variable, see the IBM Informix Guide to SQL: Reference.
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