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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.
User-Defined Routines and Data Types Developer's GuideThe Informix® User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL Informix®.
Improve UDR performance
Parallel UDRs
Enable parallel UDRs
Turn on PDQ and review other configuration parameters

Turn on PDQ and review other configuration parameters

Parallel execution of queries is turned off by default. To turn on parallel execution, use one of the following methods:

Set the environment variable PDQPRIORITY greater than 0.
Execute the SQL statement SET PDQPRIORITY.

The PDQ configuration parameters have the same effect on parallel UDRs as on regular PDQ queries. For example, the DS_MAX_SCANS parameter specifies the maximum number of scan threads that the database server can execute concurrently.

For information about how to tune the PDQ configuration parameters, refer to the Informix® Performance Guide.

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