The semantic layer enables the user to view the technical layers of the database? True/False

True or False: 1. I can use SQL standard commands to CREATE ROLES and also to DROP ROLES which helps me to organize the permissions for large groups of users who perform the same tasks in our database. 2. Data Mining involves the use of very large data sets. As part of the Knowledge Data Design process, we clean data after encoding it for its intended outputs. 3. Classification Rules are used with our large data sets to facilitate machine learning and other summary outputs. Classification is accomplished by allowing the DBMS to determine the classifications and which records are in each class.

Either an E-R diagram or a DBDL may be used to depict the framework of a database. Tell me about the tactic you like most and why you prefer it.

What is the most critical technique a database designer may use to impact database performance under certain usage scenarios?