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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 DS_TOTAL_MEMORY configuration parameter and memory utilizationThe DS_TOTAL_MEMORY configuration parameter places a ceiling on the amount of shared memory that a query can obtain. You can use this parameter to limit the performance impact of large, memory-intensive queries. The higher you set this parameter, the more memory a large query can use, and the less memory is available for processing other queries and transactions.
Deriving a working value for decision-support memoryIn the second part of the algorithm that the database server uses to derive the new value for the DS_TOTAL_MEMORY configuration parameter, the database server establishes a working value for the amount of decision-support memory.

Deriving a working value for decision-support memory

In the second part of the algorithm that the database server uses to derive the new value for the DS_TOTAL_MEMORY configuration parameter, the database server establishes a working value for the amount of decision-support memory.

The database server verifies this amount in the third and final part of the algorithm.

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