The Data Dictionary: A Unique Schema
Every Oracle database uses a number of system tables and views to keep track of metadata—data about the data in a database. This collection of system objects is called the Oracle database's data dictionary or system catalog. Oracle organizes a database's data dictionary within the SYS schema.
Categories of Data Dictionary Views
Oracle's data dictionary contains several different categories of data dictionary views:
Views with the prefix DBA_ Present all information in the corresponding data dictionary base tables. Because the DBA views are comprehensive, they are accessible only to users that have been granted ...
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