Home
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® Module Development OverviewThe HCL Informix® DataBlade® module overview serves as an overview of the HCL Informix® DataBlade® module development process.
DataBlade® module concepts
DataBlade® modules and the database serverThis section describes the overall architecture of the HCL Informix® database server, how DataBlade® modules affect database server processes, and the application programming interfaces you can use in your DataBlade® modules and client applications.
Internal architecture of the database serverIf you want to add user-defined routines to your HCL Informix® database server, you must understand the internal architecture of the database server and how DataBlade® module routines can affect the database system.
DataBlade® modules and virtual processorsThe internal architecture of your HCL Informix® database server contains virtual processors.

DataBlade modules and virtual processors

The internal architecture of your HCL Informix® database server contains virtual processors.

Virtual processors are operating system tasks that execute requests. Virtual processors are separated into virtual processor classes. Each of the virtual processor classes provided in the database server handles a different type of task, such as executing queries and routines, fetching data from disk, and administering network connections. You can create user-defined virtual processors to handle tasks you define.

One of the critical virtual processors is the CPU VP, which acts as a router and handles basic administrative tasks, processes certain user requests, and delegates other requests to the appropriate processor. Tasks thus participate in a highly distributed environment that is optimized for performance and scalability.

By default, all user-defined routines execute in the CPU VP; however, if your DataBlade® module routine uses certain system services, you must assign it to a user-defined virtual processor. A user-defined VP is created by the system administrator and executes only those routines assigned to it. For more information about the system services that require a user-defined VP, see the Informix Administrator's Guide.

Rate this topic

5 stars 4 stars 3 stars 2 stars 1 star

Comment on this topic.

By clicking this box, you acknowledge that you are NOT a U.S. Federal Government employee or agency, nor are you submitting information with respect to or on behalf of one. HCL provides software and services to U.S. Federal Government customers through its partners immixGroup, Inc. Contact this team at https://hcltechsw.com/resources/us-government-contact. Do not include any personal data in this Comment box.