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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® 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 Informix®.
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 Informix® databases.
Virtual-Index Interface GuideThe Informix® Virtual-Index Interface Programmer's Guide explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of HCL Informix® typically with a DataBlade® module.
Develop an access methodThese topics describe the steps that you take to implement a user-defined access method with the Virtual-Index Interface (VII).
Specify an operator class
Supplying an operator class for a secondary access method

Supplying an operator class for a secondary access method

About this task

To supply an operator class for a secondary access method, complete the following steps:

Procedure

Write support and strategy functions for the operator class if no existing functions suit the data types that the access method indexes.
Register each new support and strategy function with the CREATE FUNCTION statement that includes the NONVARIANT modifier.
Assign the strategy and support functions to operator classes with the CREATE OPCLASS statement.
Assign an operator class as default to the secondary access method with the ALTER ACCESS_METHOD statement.

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