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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.
Descriptor function reference
Descriptors
Files to include in the access-method buildThe access method must include header files with descriptor and function declarations.

Files to include in the access-method build

The access method must include header files with descriptor and function declarations.

Several files contain definitions that the access method references. Include the following files in your access-method build:

The mi.h file defines the DataBlade® API descriptors, other opaque data structures, and function prototypes.
The miami.h file defines the descriptors and prototypes for the VII.
If your access method alters the default memory duration, include the memdur.h and minmdur.h files.
To call GLS routines for globalization, include ifxgls.h.

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