Home
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
Access-method componentsWhen you add an access method to HCL Informix®, you add, or register, a collection of C user-defined routines (UDRs) in the system catalog. These UDRs take advantage of the Informix® application programming interface (API), the Virtual-Index Interface (VII).
Components that the Informix® database server provides
SQL extensionsThe HCL Informix® extension to ANSI SQL-92 entry-level standard SQL includes statements and keywords that specifically call user-defined access methods.
Register the access method in a databaseThe CREATE SECONDARY ACCESS_METHOD statement registers a user-defined access method. When you register an access method, the database server puts information in the system catalog that identifies the purpose functions and other properties of the access method.

Register the access method in a database

The CREATE SECONDARY ACCESS_METHOD statement registers a user-defined access method. When you register an access method, the database server puts information in the system catalog that identifies the purpose functions and other properties of the access method.

ALTER ACCESS_METHOD changes the registration information in the system catalog, and DROP ACCESS_METHOD removes the access-method entries from the system catalog.

Rate this topic

5 stars 4 stars 3 stars 2 stars 1 star

Comment on this topic.

By clicking this box, you acknowledge that you are NOT a U.S. Federal Government employee or agency, nor are you submitting information with respect to or on behalf of one. HCL provides software and services to U.S. Federal Government customers through its partners immixGroup, Inc. Contact this team at https://hcltechsw.com/resources/us-government-contact. Do not include any personal data in this Comment box.