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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.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
Disk, memory, and process management
Shared memoryThese topics describe the content of database server shared memory, the factors that determine the sizes of shared-memory areas, and how data moves into and out of shared memory.
Virtual portion of shared memoryThe virtual portion of shared memory is expandable by the database server and can be paged out to disk by the operating system.
Data-distribution cacheThe database server uses distribution statistics generated by the UPDATE STATISTICS statement in the MEDIUM or HIGH mode to determine the query plan with the lowest cost.
SPL routine and the UDR cacheThe database server converts an SPL routine to executable format and stores the routine in the UDR cache, where it can be accessed by any session.

SPL routine and the UDR cache

The database server converts an SPL routine to executable format and stores the routine in the UDR cache, where it can be accessed by any session.

When a session is required to access an SPL routine or other user-defined routine for the first time, the database server reads the definition from the system catalog tables and stores the definition in the UDR cache.

You can configure the size of the UDR cache with the PC_HASHSIZE and PC_POOLSIZE configuration parameters. For information about changing the default size of the UDR cache, see the chapter on queries and the query optimizer in your HCL OneDB™ Performance Guide.