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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.
User-Defined Routines and Data Types Developer's GuideThe Informix® User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL Informix®.
Improve UDR performance
Extend UPDATE STATISTICS
Support functions for UPDATE STATISTICS
The stat data type

The stat data type

The statcollect() and statprint() functions use an SQL data type called stat.

The corresponding C language structure is called mi_statretval. For an exact description of mi_statretval, see the libmi header file.

Most of the information in mi_statretval is manipulated internally. However, two fields must be filled in by statcollect():

The statdata field should contain the histogram for the distribution. UDTs are stored in a multirepresentational format.
The szind field should be set to either MI_MULTIREP_SMALL or MI_MULTIREP_LARGE.

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