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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_istats_setnunique() accessor functionThe mi_istats_setnunique() function stores the number of unique index keys in the statistics descriptor.

The mi_istats_setnunique() accessor function

The mi_istats_setnunique() function stores the number of unique index keys in the statistics descriptor.

Syntax

void mi_istats_setnunique(MI_AM_ISTATS_DESC *istatsDesc,
   mi_integer nunique)

istatsDesc: Points to the statistics descriptor.
nunique: Indicates the number of unique keys in the index.

Usage

Call this function from am_stats. The database server places the value that this function sets in the nunique entry of the sysindices system catalog table.

Return values

None

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