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Oracle Database Administrator Certified Expert is an expert-level credential designed to manage a large scale database and enhances the knowledge regarding the concepts and architecture relating to database, backup, and recovery procedures using RMAN, Enterprise Manager ,and various kinds of flashback technologies, instance configuration, and job scheduling. Oracle Database Administrator Certified Expert exam validates expertise to perform complex, hands-on activities through study, labs, and practice. uCertify study guide for the 1Z0-052 and 1Z0-054 exams.
There are no such pre-requisites for the OCE certification.