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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.
Stack sizeYou can specify stack size only for a user-defined routine written in C.

Stack size

You can specify stack size only for a user-defined routine written in C.

Stack space is allocated from a common region in shared memory that can be overrun if a routine consumes more stack space than is allocated for it. To avoid stack overrun:

Allocate sufficient stack space for all the local variables in the routine. Monitor stack usage with the onstat utility.
Execute recursively called C routines with the mi_call() function. Pass any arguments other than mi_integer data types by reference.

When you specify a stack size for a user-defined routine, the database server allocates the specified amount of memory for every execution iteration of the routine.

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