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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 Informix® database servers.
Performance GuideThe Informix® Performance Guide describes how to configure and operate your HCL Informix® 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 Informix® configuration parameters can affect CPU utilization. You can change the settings of the Informix® 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.
Specifying virtual processor class informationUse the VPCLASS configuration parameter to specify a class of virtual processors, the number of virtual processors that the database server should start for a specific class, and the maximum number allowed.
Disabling process priority aging for CPU VPsUse the noage option of the VPCLASS configuration parameter to disable process priority aging for database server CPU VPs on operating systems that support this feature. Priority aging occurs when the operating system lowers the priority of long-running processes as they accumulate processing time. You might want to disable priority aging because it can cause the performance of the database server processes to decline over time.

Disabling process priority aging for CPU VPs

Use the noage option of the VPCLASS configuration parameter to disable process priority aging for database server CPU VPs on operating systems that support this feature. Priority aging occurs when the operating system lowers the priority of long-running processes as they accumulate processing time. You might want to disable priority aging because it can cause the performance of the database server processes to decline over time.

Your database server distribution includes a machine notes file that contains information about whether your version of the database server supports this feature.

Specify the noage option of VPCLASS if your operating system supports this feature.

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