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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.
Design decisionsThese topics present the choices that you make to optimize the performance and flexibility of the access method that you can create with the virtual-index interface (VII).
Data definition statements
Interpret the table descriptorA table descriptor contains data definition specifications, such as owner, column names and data types, and storage space that the CREATE INDEX, ALTER INDEX, and ALTER FRAGMENT statements specify for the virtual index. A table descriptor describes a single table fragment, so that the storage space and fragment identifier (part number) change in each of multiple table descriptors that the database server constructs for a fragmented index.

Interpret the table descriptor

A table descriptor contains data definition specifications, such as owner, column names and data types, and storage space that the CREATE INDEX, ALTER INDEX, and ALTER FRAGMENT statements specify for the virtual index. A table descriptor describes a single table fragment, so that the storage space and fragment identifier (part number) change in each of multiple table descriptors that the database server constructs for a fragmented index.

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