Discuss the differences between a data definition language (ddl) and a data manipulation language (dml). what operations would you typically expect to be available in each language? describe the main characteristics of the database approach and the file-based approach. contrast the two different approaches. provide a definition for a physical database designer, data administrator and a database administrator. what role do they play for the database? what types of interactions would these users of the database have? what is concurrency control and why does a dbms need a concurrency control facility? what is a database transaction? give 2 examples of a transaction. what is meant by the term ‘client-server architecture’ and what are the advantages of this approach? what is a transaction processing monitor? what advantages does a tp monitor bring to an oltp environment? define logical data independence and physical database independence. how do they relate to the ansi-sparc database architecture. define cloud computing. name and define the two principal integrity rules for the relational model. describe the differences between a view and a base relation.