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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).
Choose features for the access methodThe Virtual-Index Interface (VII) provides many optional features. Choose the features that you need to fulfill the access-method specifications.

Choose features for the access method

The Virtual-Index Interface (VII) provides many optional features. Choose the features that you need to fulfill the access-method specifications.

The following optional features support data definition:

Data in extspaces, sbspaces, or both
Fragmentation
Unique indexes
Alternative indexes on the same columns
Multiple-column index keys

Support for the following optional features can contribute to access-method performance:

Clustered data
Parallel-function execution
More than one row returned per scan-function call
More than one index entry inserted per insert-function call
Key scan, which creates rows from index keys
Complex qualifications

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