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Object oriented languages support the development of systems to solve many of today's computing problems where both the processing and data is complex. Data can be complex both in type and relationships. Modeling the data as objects is a natural way to represent this real world data. ODBMSs are an easy way to persist application objects, avoiding the overhead of an object to relational mapping. ODBMSs persist objects of any degree of complexity that the object language can define. However through the lifetime of a system processing and data requirements change resulting in changes to the underlying object model. Managing these changes without having to take the application down is a key requirement in many of these systems.
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