Limiting the performance impact of CPU-intensive queries

The DS_MAX_QUERIES configuration parameter specifies a maximum number of decision-support queries that can run at any one time. Queries with a low PDQ priority use proportionally fewer resources, so a larger number of those queries can run simultaneously. You can use the DS_MAX_QUERIES configuration parameter to limit the performance impact of CPU-intensive queries.

The DS_MAX_QUERIES configuration parameter controls only queries with a PDQ priority that is nonzero.

The database server uses the value of DS_MAX_QUERIES with DS_TOTAL_MEMORY to calculate quantum units of memory to allocate to a query. For more information about how the database server allocates memory to queries, see The DS_TOTAL_MEMORY configuration parameter and memory utilization.

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