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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™.
Create user-defined aggregates
Manage aggregates
Aggregate information in the system catalog

Aggregate information in the system catalog

The CREATE AGGREGATE statement registers an aggregate in the sysaggregates system catalog table. The person who registers the aggregate with CREATE AGGREGATE is the owner of the aggregate. The sysaggregates table does not include information about built-in aggregates.

Both user-extended built-in aggregates and user-defined aggregates require user-defined functions. The system catalog tables sysprocauth, sysprocbody, and sysprocedures record information about the functions that you create, including those that support user-defined aggregates and extensions of built-in aggregates.

For descriptions of the system catalog tables, see the HCL OneDB™ Guide to SQL: Reference.

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