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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_tab_update_stat_mode() accessor functionThe mi_tab_update_stat_mode() function indicates whether an UPDATE STATISTICS function includes a LOW, MEDIUM, or HIGH mode keyword.

The mi_tab_update_stat_mode() accessor function

The mi_tab_update_stat_mode() function indicates whether an UPDATE STATISTICS function includes a LOW, MEDIUM, or HIGH mode keyword.

Syntax

MI_UPDATE_STAT_MODE 
mi_tab_update_stat_mode(MI_AM_TABLE_DESC *tableDesc)

tableDesc: Points to the table descriptor.

Usage

To extract the distribution-level keyword that an UPDATE STATISTICS statement specifies, the am_stats purpose function calls the mi_tab_update_stat_mode() function. Three keywords describe distribution level, HIGH, MEDIUM, and the default LOW.

If a purpose function other than am_stats calls mi_tab_update_stat_mode(), the return value indicates that UPDATE STATISTICS is not running.

Return values

MI_US_LOW: Indicates that the update statistics statement specifies the low keyword or that low is in effect by default.
MI_US_MED or: Indicates that the UPDATE STATISTICS specifies the medium keyword.
MI_US_HIGH: Indicates that the UPDATE STATISTICS specifies the HIGH keyword.
MI_US_NOT_RUNNING: Indicates that no UPDATE STATISTICS statement is executing.
MI_US_ERROR: Indicates an error.

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