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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.
Effect of configuration on memory utilizationThe combination of operating-system and HCL OneDB™ 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.
Checking the derived value for decision-support memoryIn the final part of the algorithm that the database server uses to derive the new value for the DS_TOTAL_MEMORY configuration parameter, the database server verifies that the amount of shared memory is greater than min_ds_total_memory and less than the maximum possible memory space for your computer.

Checking the derived value for decision-support memory

In the final part of the algorithm that the database server uses to derive the new value for the DS_TOTAL_MEMORY configuration parameter, the database server verifies that the amount of shared memory is greater than min_ds_total_memory and less than the maximum possible memory space for your computer.

When the database server finds that the derived value for decision-support memory is less than the value of the min_ds_total_memory variable, it sets decision-support memory equal to the value of min_ds_total_memory.

When the database server finds that the derived value for decision-support memory is greater than the maximum possible memory space for your computer, it sets decision-support memory equal to the maximum possible memory space.