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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, making the view invisible in the catalog. The view can still be directly referenced, and is still eligible for use during query processing. 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 be still unloaded and reloaded into other databases.
Hiding a materialized view is irreversible, and can only be performed using SQL statements.
Connect to the database as the DBA, or as owner of the materialized view.
Execute an ALTER MATERIALIZED VIEW statement with the SET HIDDEN clause.
The following statement hides the EmployeeConfidential materialized view.
ALTER MATERIALIZED VIEW EmployeeConfidential SET HIDDEN;