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- W177977618 abstract "Extensibility is a desirable goal for object-oriented database systems. The extensibility in object-oriented databases is motivated by the need to support several advanced features that are evolving. Moreover, the schema in an object-oriented database is also evolving.We introduce a new approach to achieve extensibility in object-oriented databases. This approach is based on an object-oriented design and implementation of the database system where the schema components are captured as persistent instances of a set of system classes.The extensibility in our approach has been used to support several advanced features, namely schema evolution, schema versioning, and dynamic views. Schema evolution is the ability to make a variety of changes to a database schema without reorganization. Schema versioning is the ability to manipulate multiple schema versions and to keep track of schema changes. Dynamic views are rearranged parts of schemas relevant to a set of users, which are subject to change.Schema evolution operations have been defined and the effect of these operations on the structural components has been addressed. We also address the effect of these on the behavioral components represented by the method implementations. A framework for view definition and manipulation is described which is based on a DAG rearrangement view, called DAGR view. This approach provides the user with a set of operations to manipulate a class hierarchy for view construction. Also, the implementation of an environment for a Graphical Object-Oriented Schema Environment (GOOSE) is described.Finally, we describe a performance analysis of algorithms for validating inverse relationships in object-oriented database systems. This includes the introduction of different approaches for supporting inverse relationships. We also describe a set of hash-based algorithms for validating the inverse relationships along with their performance analysis." @default.
- W177977618 created "2016-06-24" @default.
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- W177977618 date "1992-01-01" @default.
- W177977618 modified "2023-09-24" @default.
- W177977618 title "Extensible object-oriented databases with dynamic schemas" @default.
- W177977618 hasPublicationYear "1992" @default.
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