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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
Optimize a user-defined routine

Optimize a user-defined routine

The query optimizer decides how to perform a query. A query plan is a specific way a query might be performed. A query plan includes how to access the table or tables included in the query, the order of joining tables, and the use of temporary tables. The query optimizer finds all feasible query plans. The optimizer estimates the cost to run each plan and then selects the plan with the lowest cost estimate.

Tip: For more information about query optimization, refer to the HCL OneDB™ Performance Guide.

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