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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 PHYSBUFF configuration parameter and memory utilizationThe PHYSBUFF configuration parameter determines the amount of shared memory that is reserved for each of the two buffers that serve as temporary storage space for data pages that are about to be modified. The size of a buffer determines how often it fills and therefore how often it must be flushed to the physical log on disk.

The PHYSBUFF configuration parameter and memory utilization

The PHYSBUFF configuration parameter determines the amount of shared memory that is reserved for each of the two buffers that serve as temporary storage space for data pages that are about to be modified. The size of a buffer determines how often it fills and therefore how often it must be flushed to the physical log on disk.

Choose a value for PHYSBUFF that is an even increment of the system page size.

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