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The operational maintenance is the process of monitoring and maintaining the database system.Monitoring means that the performance of the system is observed. If the performance of the system falls below an acceptable level, tuning or reorganization of the database may be required.Maintaining and upgrading the database system means that, when new requirements arise, the new development lifecycle will be done. Source: Connolly, Begg. 2005. Database Systems. A Practical Approach to Design, Implementation, and Management. Addison Wesley. Chapter 9. Database Planning, Design and Administration.
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