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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.
DataBlade® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL Informix® databases.
DBDK InfoShelfThe DataBlade® Developers Kit InfoShelf is designed to help you work with BladeSmith.
DataBlade® Developers Kit TutorialThe Tutorial is a set of exercises that demonstrate how to create extensions to HCL Informix® and package them as DataBlade® modules by using DBDK. Support for DataBlade Developers Kit (DBDK) is removed starting Informix Server 14.10.xC6.
GlossaryThis section contains additional reference information
Cost of a routine

Cost of a routine

The relative cost of a routine is used by the query optimizer to determine in which order to process WHERE clauses in a SELECT statement. More expensive routines are called after less expensive routines. A cost of 0 indicates that the routine costs about the same as the routines in the reference list that have a cost of 0. The standard formula for computing routine cost is as follows:

lines_of_code + (I/O_operations x 100)

You must follow the general formula to ensure that your routines interact with other DataBlade® module routines in a predictable way.

In this tutorial, all routines are inexpensive and have a cost of 0.

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