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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™.
Extend an operator class
Operator classes
Secondary-access methods

Secondary-access methods

A secondary-access method, often called an index, is a set of user-defined functions that build, access, and manipulate an index structure. These functions encapsulate index operations, such as how to scan, insert, delete, or update nodes in an index. A secondary-access method describes how to access the data in an index that is built on a column (column index) or on a user-defined function (functional index). Typically, a secondary-access method speeds up the retrieval of a type of data.

The database server provides definitions for the following secondary-access methods in the system catalog tables of each database:

A generic B-tree
An R-tree

DataBlade® modules can provide additional secondary-access methods for use with UDTs. For more information about secondary-access methods of DataBlade modules, refer to the user guide for each DataBlade module. For more information about R-trees, refer to the R-Tree Index User's Guide.