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OCA Oracle Database 12c Installation and Administration Exam Guide (Exam 1Z0-062), 2nd Edition by John Watson

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CERTIFICATION OBJECTIVES
    image   Two-Minute Drill
Users never see a physical datafile. All they see are logical segments. System administrators never see a logical segment. All they see are physical datafiles. The Oracle database provides complete abstraction of logical storage from physical. This is one of the requirements of the relational database paradigm. As a DBA, you must be aware of the relationship between logical and physical storage. ...

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