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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®.
Develop an access methodThese topics describe the steps that you take to implement a user-defined access method with the Virtual-Table Interface (VTI).
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.
Check data integrityIf you implement the oncheck command with the am_check access method, you can run the oncheck command with appropriate options on a command line. The access method can issue messages that describe any problems in the test data.

Check data integrity

If you implement the oncheck command with the am_check access method, you can run the oncheck command with appropriate options on a command line. The access method can issue messages that describe any problems in the test data.

For more information about how to implement the oncheck processing, see the description of The am_check purpose function. For more information about how to specify options on the command line for oncheck, see the .

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