Object DBMSs allow you to store objects directly without any mapping to different data structures. Relational DBMSs require mapping from objects to tables. This mapping to different data structures is called "impedance mismatch." The figure below shows direct storage at the left and impedance mismatch at the right.
This lack of impedance mismatch in Object DBMSs gives them a performance advantage over Relational DBMSs, especially on complex data. Impedance mismatch slows down performance on complex data because of processing needed map from one data structure (tables) to another (objects). For more information see impedance mismatch . Also see complex data.
More on the general topic: Object-Oriented Database Management System (OODBMS) Definition
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Author: Douglas K Barry
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The Savvy Manager's Guide
Douglas K Barry is also the author of a book that explains Web Services, service-oriented architecture, and Cloud Computing in an easy-to-understand, non-technical manner.
Web Services, Service-Oriented Architectures, and Cloud Computing: The Savvy Manager's Guide (Second Edition)
by Douglas K Barry with David Dick
This is a guide for the savvy manager who wants to capitalize on the wave of change that is occurring with Web Services, service-oriented architecture, and—more recently—Cloud Computing. The changes wrought by these technologies will require both a basic grasp of the technologies and an effective way to deal with how these changes will affect the people who build and use the systems in our organizations. This book covers both issues. Managers at all levels of all organizations must be aware of both the changes that we are now seeing and ways to deal with issues created by those changes.