User control of PDQ resources

To indicate the PDQ priority of a query, you can set the PDQPRIORITY environment variable or execute the SET PDQPRIORITY statement prior to issuing a query. These PDQ priority options allow you to request a certain amount of parallel-processing resources for the query.

The resources that you request and the amount of resources that the database server allocates for the query can differ. This difference occurs when the database server administrator uses the MAX_PDQPRIORITY configuration parameter to put a ceiling on user-requested resources, as the following topic explains.