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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for HCL OneDB™.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in HCL OneDB™ databases.
User-Defined Routines and Data Types Developer's GuideThe HCL OneDB™ User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL OneDB™.
Improve UDR performance
Memory considerations
Virtual-memory cache for routines
UDR cache

UDR cache

When any session requires the use of an SPL routine for the first time, the database server reads the system catalog tables to retrieve the code for the SPL routine. The database server converts the p-code to an executable form. The database server caches this executable form of the SPL routine in the virtual portion of shared memory.

The database server keeps the executable format of an SPL routine in the UDR cache on a most recently used basis.

You can monitor the UDR cache with the -g prc option of the onstat utility. For more information about onstat -g prc and adjusting the size of the UDR cache with the PC_POOLSIZE configuration parameter, refer to the HCL OneDB™ Performance Guide.