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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.
DataBlade® Developers Kit User's GuideThe HCL Informix® DataBlade® Developers Kit User's Guide describes how to use tools to develop and package DataBlade® modules.
Create DataBlade® objects by using BladeSmithUse BladeSmith to create DataBlade® modules.
Create DataBlade® module objectsBladeSmith uses wizards to create and edit objects.
Create routinesYou can define public or private user-defined routines that support your DataBlade® module. You can specify if the routine is called by SQL or is an internal routine.
Cost of routineYou can specify cost only for user-defined routines written in C.

Cost of routine

You can specify cost only for user-defined routines written in C.

The relative cost of the routine is used by the query optimizer to determine the order in which to process WHERE clauses in a SELECT statement. Expensive routines are called after inexpensive 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 reference list shows all user-defined routines created in the project. The standard formula for computing routine cost is:

lines_of_code + (I/O_operations x 100)

Because the optimizer compares routine costs, the actual cost is irrelevant; only the relative cost matters. However, follow the general formula to ensure that your routines interact with other DataBlade® module routines in a predictable way.

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