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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.
Parallel database query (PDQ)You can manage how the database server performs PDQ and you can monitor the resources that the database server uses for PDQ.
The allocation of resources for parallel database queriesWhen you configure the database server, consider how the use of PDQ affects users of OLTP, decision-support (DSS) applications, and other applications. Then you can plan how to allocate resources for PDQ.
Limiting the priority of decision-support queriesYou can limit the parallel processing resources that decision-support (DSS) queries consume by adjusting the values of PDQPRIORITY environment variable, the MAX_PDQPRIORITY configuration parameter, and other configuration parameters.
Maximizing OLTP throughput for queriesAt times, you might want to allocate resources to maximize the throughput for individual OLTP queries rather than for decision-support queries.

Maximizing OLTP throughput for queries

At times, you might want to allocate resources to maximize the throughput for individual OLTP queries rather than for decision-support queries.

In this case, set MAX_ PDQPRIORITY to 0, which limits the value of PDQ priority to OFF. A PDQ priority value of OFF does not prevent decision-support queries from running. Instead, it causes the queries to run without parallelization. In this configuration, response times for decision-support queries might be slow.