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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
Most database applications are multiuser. Perhaps they may have thousands of concurrent users. This means that there will be times when two or more sessions need to access the same data at the same time. The Oracle database has row- and table-locking mechanisms that will manage this, thus ensuring data integrity. The locking mechanisms can (and in most cases, ...

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