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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
Behavior of routines

Behavior of routines

While it is recommended that all new routines be defined as poorly behaved, for the purposes of this tutorial, you must check well behaved in the New Routine wizard.

Well behaved

A routine is well-behaved if it:

Yields the CPU on a regular basis to other threads.
Does not use blocking operating-system calls.
Does not allocate local resources.
Does not modify the global virtual processor state.

Poorly behaved

If you have a poorly behaved routine, check poorly behaved and type the name of a user-defined virtual processor in the user-defined virtual processor class box. If you let a poorly behaved routine run in the CPU virtual processor, you could experience potentially severe performance problems. You must create the user-defined virtual processor before you register the DataBlade® module containing routines that run in it.

See the Informix® DataBlade API Programmer's Guide for more information about coding practices and creating and configuring a user-defined virtual processor.

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