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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 rollback and recoveryThe OFF_RECVRY_THREADS, ON_RECVRY_THREADS, PLOG_OVERFLOW_PATH, and RTO_SERVER_RESTART configuration parameters affect recovery. The LOW_MEMORY_RESERVE configuration parameter reserves a specific amount of memory, in kilobytes, for the database server to use when critical activities, such as rollback activities, are needed.
PLOG_OVERFLOW_PATH and its effect on fast recoveryThe PLOG_OVERFLOW_PATH configuration parameter specifies the location of a disk file (named plog_extend.servernum) that the database server uses if the physical log file overflows during fast recovery.

PLOG_OVERFLOW_PATH and its effect on fast recovery

The PLOG_OVERFLOW_PATH configuration parameter specifies the location of a disk file (named plog_extend.servernum) that the database server uses if the physical log file overflows during fast recovery.

The database server removes the plog_extend.servernum file when the first checkpoint is performed during a fast recovery.