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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™.
Create an opaque data type
Opaque data types
Advantages of opaque data types

Advantages of opaque data types

Both an opaque data type and a row data type allow you to define members of the data type. The advantages of creating an opaque data type rather than a row data type are as follows.

The opaque data type is more compact to store.
The opaque data type does not have the overhead in the system catalog that a row data type requires.
The opaque data type is more efficient.
The support functions of an opaque data type manipulate the internal structure of the opaque data type directly. You do not need to take special steps (DataBlade® API calls or SQL dot notation) to extract data from the members as you must do for the fields of a row data type.

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