You can hide a materialized view's definition from users. When you hide a materialized view, you obfuscate the view definition stored in the database.
You must have DBA authority, or be the owner of the materialized view
Context and remarks
When a materialized view is hidden, debugging using the debugger will not show the view definition, nor will the definition be available through procedure profiling, and the view can still be unloaded and reloaded into other databases.
Hiding a materialized view is irreversible and only possible using SQL.
Connect to the database.
Execute an ALTER MATERIALIZED VIEW ... SET HIDDEN statement.
The following statements create a materialized view, EmployeeConfid3, refreshes it, and then obfuscates its view definition.
CREATE MATERIALIZED VIEW EmployeeConfid3 AS SELECT EmployeeID, Employees.DepartmentID, SocialSecurityNumber, Salary, ManagerID, Departments.DepartmentName, Departments.DepartmentHeadID FROM Employees, Departments WHERE Employees.DepartmentID=Departments.DepartmentID; REFRESH MATERIALIZED VIEW EmployeeConfid3; ALTER MATERIALIZED VIEW EmployeeConfid3 SET HIDDEN;
When you are done running the following example, you should drop the materialized view you created. Otherwise, you will not be able to make schema changes to its underlying tables Employees and Departments, when trying out other examples.
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