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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 memory utilizationThe combination of operating-system and Informix® configuration parameters can affect memory utilization.
Configuration parameters that affect memory utilizationA large number of configuration parameters in the ONCONFIG file affect memory utilization and performance.
Setting the size of the buffer pool, logical-log buffer, and physical-log bufferThe values that you specify for the BUFFERPOOL, DS_TOTAL_MEMORY, LOGBUFF, and PHYSBUFF configuration parameters depend on the type of applications that you are using (OLTP or DSS) and the page size.
The LOW_MEMORY_RESERVE configuration parameter and memory utilizationThe LOW_MEMORY_RESERVE configuration parameter reserves a specific amount of memory, in kilobytes, for the database server to use when critical activities are needed and the server has limited free memory.

The LOW_MEMORY_RESERVE configuration parameter and memory utilization

The LOW_MEMORY_RESERVE configuration parameter reserves a specific amount of memory, in kilobytes, for the database server to use when critical activities are needed and the server has limited free memory.

If you enable the new LOW_MEMORY_RESERVE configuration parameter by setting it to a specified value in kilobytes, critical activities, such as rollback activities, can complete even when you receive out-of-memory errors.

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