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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Performance GuideThe HCL OneDB™ Performance Guide describes how to configure and operate your HCL OneDB™ database server to improve overall system throughput and to improve the performance of SQL queries.
Effect of configuration on CPU utilizationThe combination of operating-system and HCL OneDB™ configuration parameters can affect CPU utilization. You can change the settings of the HCL OneDB™ configuration parameters that directly affect CPU utilization, and you can adjust the settings for different types of workloads.
Configuration parameters and environment variables that affect CPU utilizationSome configuration parameters and environment variables affect CPU utilization. You might need to adjust the settings of these parameters and variables when you consider methods of improving performance.
Limiting the performance impact of CPU-intensive queriesThe 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.

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.