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Designing databasesThe first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
Designing and Implementing a DatabaseThe HCL OneDB™ Database Design and Implementation Guide provides information to help you design, implement, and manage your HCL® OneDB® databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.
Managing databases
Grant and limit access to your database
Grant privileges
Automate privileges
Roles
Confirm membership In roles and drop roles

Confirm membership In roles and drop roles

You can find yourself in a situation where you are uncertain which user is included in a role. Perhaps you did not create the role, or the person who created the role is unavailable. Issue queries against the sysroleauth and sysusers system catalog tables to find who is authorized for which table and how many roles exist.

After you determine which users hold which roles, you might discover that some roles are no longer useful. To remove a role, use the DROP ROLE statement. Before you remove a role, the following conditions must be met:

Only roles that are listed in the sysusers system catalog table as a role can be deleted, but you cannot drop a built-in role (such as NONE or EXTEND).
You must have DBA privileges, or you must be given the grantable option in the role to drop a role.

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