Home
Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ 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 HCL OneDB™.
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 HCL OneDB™ databases.
User-Defined Routines and Data Types Developer's GuideThe HCL OneDB™ 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 OneDB™.
Improve UDR performance
Parallel UDRs
Executing UDRs in parallel
Execution of a UDR in a query expression

Execution of a UDR in a query expression

One way to execute UDRs is as an expression in a query. You can take advantage of parallel execution if the UDR is in an expression in one of the following parts of a query:

WHERE clause
SELECT list
GROUP by list
Overloaded comparison operator
User-defined aggregate
HAVING clause
Select list for parallel insertion statement
Generic B-tree index scan on multiple index fragments provided that the compare function used in the B-tree index scan is parallelizable
Virtual Table Interface (VTI) or Virtual Index Interface (VII) fragments, provided that all am_purpose functions for the VTI or VII are all parallelizable