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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).
Cannot rename databases that have virtual indexesYou cannot rename a database if the database has any tables that were created using the secondary access method (also known as virtual index interface) or tables that were created using the primary access method (also known as virtual table interface).

Cannot rename databases that have virtual indexes

You cannot rename a database if the database has any tables that were created using the secondary access method (also known as virtual index interface) or tables that were created using the primary access method (also known as virtual table interface).

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