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Explain Database Administrator (DBA). The explanation will include but not be limited to the following. a.What do they do and why are they

Explain  Database Administrator (DBA). The explanation will include but not be limited to the following.
     a.What do they do and why are they needed? 
     b.The different roles and tasks of a DBA.
     C.Describe the different tools a DBA uses to administer the database?
     d.Three important Facts about DBA

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