MC	Complete this sentence: In the three-layer architecture, between the external layer and the conceptual/logical layer, there is...	The internal layer	incorrect	Logical data independence	correct	Physical data independence	incorrect	No independence, they are basically the same thing	incorrect	
MC	Complete the following sentence, choosing the right words on place <b>A</b> and <b>B</b>.<br><br>A ...<b>A</b>... data model is the mapping of a ...<b>B</b>... data model to a model that describes which data is stored where and in what format.	A: conceptual, B: internal	incorrect	A: logical, B: internal	incorrect	A: logical, B: conceptual	incorrect	A: internal, B: logical	correct	
MC	Statement A: The middle layer of the three-layer architecture consists of both the conceptual data model and the logical data model. The logical data model is physically implemented in the internal layer. <br><br> Statement B: The top level of the three-layer architecture is the external layer. Views for one or more applications always offer a window on the complete logical model.<br><br>Which sentence(s) is/are right?	Only sentence A is right	correct	Only sentence B is right	incorrect	Neither A or B is right	incorrect	Sentence A and B are right	incorrect	
MC	Statement A: The middle layer of the three-layer architecture consists of both the conceptual data model and the logical data model. The logical data model is physically implemented in the internal layer. <br><br> Statement B: The top level of the three-layer architecture is the external layer. Views for one or more applications always offer a window on the complete logical model.<br><br>Which sentence(s) is/are right?	Only sentence B is right	incorrect	Sentence A and B are right	incorrect	Only sentence A is right	correct	Neither A or B is right	incorrect	
MC	Statement A: Physical data independence implies that neither the applications, nor the views or logical data models must be changed when changes are made to the data storage specifications in the internal data model. <br><br> Statement B: Logical data independence implies that software applications are minimally affected by changes in the conceptual or logical data model. <br><br>Which sentence(s) is/are right?	A and B	correct	Only B	incorrect	Only A	incorrect	Neither A or B	incorrect	
MC	Which statement is NOT CORRECT?	In a file approach to data management, the data definitions are included in each application separately.	incorrect	The file approach to data management causes the same information to be stored separately for different applications.	incorrect	In a file approach to data management, a change in the structure of a data file is easily handled because each application has its own data files.	correct	In a file approach to data management, different applications could be using older and newer versions of the same data.	incorrect	
MC	Which statement is NOT CORRECT?	In a file approach to data management, a change in the structure of a data file is easily handled because each application has its own data files.	correct	In a file approach to data management, the data definitions are included in each application separately.	incorrect	In a file approach to data management, different applications could be using older and newer versions of the same data.	incorrect	The file approach to data management causes the same information to be stored separately for different applications.	incorrect	
MC	Statement A: Physical data independence implies that neither the applications, nor the views or logical data models must be changed when changes are made to the data storage specifications in the internal data model. <br><br> Statement B: Logical data independence implies that software applications are minimally affected by changes in the conceptual or logical data model. <br><br>Which sentence(s) is/are right?	Only A	incorrect	A and B	correct	Only B	incorrect	Neither A or B	incorrect	
MC	Which statement is NOT CORRECT?	The internal data model represents the data's physical storage details.	incorrect	In a database approach, applications don't have their own files, but all applications access the same version of the data by interfacing with the DBMS.	incorrect	It is more cumbersome to query a database system than a file-based system.	correct	In a file-based approach, every application had its own query and access procedures, even if they wanted to access the same data.	incorrect	
MC	Statement A: Physical data independence implies that neither the applications, nor the views or logical data models must be changed when changes are made to the data storage specifications in the internal data model. <br><br> Statement B: Logical data independence implies that software applications are minimally affected by changes in the conceptual or logical data model. <br><br>Which sentence(s) is/are right?	A and B	correct	Only A	incorrect	Only B	incorrect	Neither A or B	incorrect