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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®.
Descriptor function referenceThese topics provide the syntax and usage for the functions that the HCL Informix® database server supplies to access-method developers.
Accessor functionsThe Virtual-Table Interface (VTI) library contains functions that primarily access selected fields from the various descriptors.
The mi_tstats_setnpages() accessor functionThe mi_tstats_setnpages() function stores the number of table pages in the statistics descriptor.

The mi_tstats_setnpages() accessor function

The mi_tstats_setnpages() function stores the number of table pages in the statistics descriptor.

Syntax

void mi_tstats_setnpages(MI_AM_TSTATS_DESC *tstatsDesc,
   mi_integer npages)

tstatsDesc: Points to the statistics descriptor.
npages: provides the number of pages in the table.

Usage

The am_stats purpose function sets the number of data pages, which the database server stores in the npused column of the systables system catalog table. The optimizer uses the number of pages in a table to choose an optimal query path.

Return values

None

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