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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 I/O activityThe configuration of your database server affects I/O activity.
Background I/O activitiesBackground I/O activities do not service SQL requests directly. Many of these activities are essential to maintain database consistency and other aspects of database server operation. However, they create overhead in the CPU and take up I/O bandwidth.
Configuration parameters that affect loggingThe LOGBUFF, PHYSBUFF, LOGFILES, LOGSIZE, DYNAMIC_LOGS, AUTO_LLOG, LTXHWM, LTXEHWM, SESSION_LIMIT_LOGSPACE, SESSION_LIMIT_TXN_TIME, and TEMPTAB_NOLOG configuration parameters affect logging. The LOGBUFF, PHYSBUFF, LOGFILES, LOGSIZE, DYNAMIC_LOGS, LTXHWM, LTXEHWM, and TEMPTAB_NOLOG configuration parameters affect logging.
LOGBUFF and PHYSBUFF and their effect on loggingThe LOGBUFF and PHYSBUFF configuration parameters affect logging I/O activity because they specify the respective sizes of the logical-log and physical-log buffers that are in shared memory. The size of these buffers determines how quickly the buffers fill and therefore how often they need to be flushed to disk.

LOGBUFF and PHYSBUFF and their effect on logging

The LOGBUFF and PHYSBUFF configuration parameters affect logging I/O activity because they specify the respective sizes of the logical-log and physical-log buffers that are in shared memory. The size of these buffers determines how quickly the buffers fill and therefore how often they need to be flushed to disk.