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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.
Descriptor function reference
Accessor functionsThe Virtual-Index Interface (VII) library contains functions that primarily access selected fields from the various descriptors.
The mi_tab_amparam() accessor functionThe mi_tab_amparam() function retrieves any user-defined configuration values for the index.

The mi_tab_amparam() accessor function

The mi_tab_amparam() function retrieves any user-defined configuration values for the index.

Syntax

mi_string* mi_tab_amparam(MI_AM_TABLE_DESC *tableDesc);

tableDesc: Points to the index descriptor.

Usage

If the access method supports configuration keywords, the USING access-method clause of the CREATE INDEX statement can specify values for those keywords. A user or application can apply values to adjust the way in which the access method behaves.

To support multiple indexes on the same key column or composite of columns, use the configuration keywords as the example in Enable alternative indexes demonstrates.

To ensure that a CREATE INDEX statement does not duplicate the definition of another index, use the functions mi_tab_param_exist() and mi_tab_nparam_exist().

Return values

The pointer accesses a string that contains user-specified keywords and values. A NULL-valued pointer indicates that the CREATE INDEX statement specified no configuration keywords.

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