1. a) The DBA (DB Administrator) is ultimately responsible for every aspect of DBMS, Briefly identify & describe three responsibilities of a DBA. b) The DBA's responsibilities are constantly changing....

Extracted text: 1. a) The DBA (DB Administrator) is ultimately responsible for every aspect of DBMS, Briefly identify & describe three responsibilities of a DBA. b) The DBA's responsibilities are constantly changing. Briefly identify & describe two emerging characteristics or new technologies of DBs that may change the responsibilities of the DBA. c) Discuss (with example) when the Selectivity of a Query may decide the suitability of a compatible index in executing the Query.