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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
Operator classes
Generic B-tree operator class

Generic B-tree operator class

The built-in secondary-access method, the generic B-tree, has a single operator class defined in the sysopclasses system catalog table. This operator class, called btree_ops, is the default operator class for the btree secondary-access method.

The database server uses the btree_ops operator class to specify:

The strategy functions to tell the optimizer which filters in a query can use a B-tree index
The support function to build and search the B-tree index

The CREATE INDEX statement in Generic B-tree index shows how to create a B-tree index whose column uses the btree_ops operator class. This CREATE INDEX statement does not need to specify the btree_ops operator class because btree_ops is the default operator class for the btree access method.

For more information about the btree secondary-access method, see Generic B-tree index.