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“The data dictionary tables and views for a given database are stored in the SYSTEM tablespace for that database. All the data dictionary tables and views for a given database are owned by the user SYS. Connecting to the database with the SYSDBA privilege gives full access to the data dictionary. Oracle strongly recommends limiting access to the SYSDBA privilege to only those operations necessary such as patching and other administrative operations. The data dictionary is central to every Oracle database. You can view the contents of the data dictionary by querying data dictionary views, which are described in Oracle Database Reference. Be aware that not all objects in the data dictionary are exposed to users. A subset of data dictionary objects, such as those beginning with USER_% are exposed as read only to all database users.” From https://docs.oracle.com
Segundo o texto, está correto afirmar que
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