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The Microsoft Certified Database Administrator (MCDBA) credential is for database administrators, who implement and administer Microsoft SQL Server databases. this certification is appropriate for individuals who derive physical database designs, develop logical data models, create physical databases, create data services by using Transact-SQL, manage and maintain databases, configure and manage security, monitor and optimize databases, and install and configure SQL Server. This certification requires passing three core exams, and one elective exam. According to Microsoft, people who operate SQL Server 2005 should apply for other certifications such as the MCITP (Microsoft Certified IT Professional) or MCTS (Microsoft Certified Technology Specialist), rather than the MCDBA. Complete course lasts 250 hours.