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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-Table Interface GuideThe Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix® tables and to data that does not conform to the storage scheme of HCL Informix®.
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-table interface (VTI).
Data definition statements
Manage storage spacesA user-defined access method stores data in sbspaces, extspaces, or both.

Manage storage spaces

A user-defined access method stores data in sbspaces, extspaces, or both.

To access data in smart large objects, the access method must support sbspaces. To access legacy data in disk files or within another database management system, the access method supports extspaces.

Important: Your access method cannot directly create, open, or manipulate a table in a dbspace.

The following topics describe how the access method supports sbspaces, extspaces, or both.

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