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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).
Testing the access methodTo test the access method, take the same actions that users of the access method take to create and access virtual data.

Testing the access method

To test the access method, take the same actions that users of the access method take to create and access virtual data.

About this task

To test the access method:

Procedure

Create one or more storage spaces.
Use the access method to create tables in your storage spaces.
Run SQL statements to insert, query, and alter data.
Use the oncheck utility, which executes am_check, to check the integrity of the data structures that the access method writes to disk.

What to do next

Typically, a database server administrator who is responsible for the configuration of the database server performs steps 1 and 4. A database administrator performs step 2. Anyone with the appropriate SQL privileges to access or update the table that uses the access method performs step 3.

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