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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.
Access methodsThis section describes access methods, explains why you create user-defined access methods, and shows you how to create user-defined access methods
User-defined access methods
Access to storage spaces

Access to storage spaces

The database server allows a user to define a method for accessing either of the following types of storage spaces:

A smart large object, which is in an sbspace
The database server can log, back up, and recover smart large objects.
An external table, which is in an extspace
An extspace refers to a storage location that the HCL Informix® database server does not manage. For example, an extspace might call a path and file name that the operating system manages or another database that a different database manager controls.
The database server does not provide transaction, backup, or recovery services for data that is in an extspace.

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