We describe a model of transactions and concurrency control that supports cooperative task and data sharing among users. The model augments traditional correctness criteria, such as global consistency for individual t...
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The object model is very promising for realtime applications that must handle complex real-world objects with short deadlines due to its capabilities for modeling, storing, and manipulating complex objects. However, r...
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An object-oriented database model is presented, as well as an object algebra. The focus of the paper is on algebraic manipulation of the object algebra for the purpose of query optimization. Various results governing ...
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We introduce partly-consistent cuts, a mechanism analogous to causal cuts, defined in the context of object-oriented databases. A partly-consistent cut is a collection containing one or more copies of every page in a ...
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ISBN:
(纸本)9783540634409
We introduce partly-consistent cuts, a mechanism analogous to causal cuts, defined in the context of object-oriented databases. A partly-consistent cut is a collection containing one or more copies of every page in a given database;the copies are made during the operation of the database, at different times. We consider four classes of partly-consistent cuts. Each class implies a different set of constraints imposed on the times when the copies are made. The consistency properties (i.e. the ability to correctly represent what happens in the actual execution of the database) of the cuts in each class are analyzed. One class, called GC-consistent cuts, can be used by a concurrent garbage collector to determine which objects to delete.
Mapping information between a global schema and its component schemas is vital for global query processing. In this paper, we continue our previous work on schema integration to propose a mechanism for specifying the ...
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作者：
Myers, A.C.MIT
Laboratory for Computer Science 545 Technology Square CambridgeMA02139 United States
It is argued that future applications will require integrity of complex, persistent data in the face of hardware and program failures. We discuss Thor, a new object-oriented database, which offers a computational mode...
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We revisit the notion of deep equality among objects in an object database from a formal point of view. We present three natural formalizations of deep equality: one based on the infinite value-trees associated with o...
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Several active object-oriented database systems have been developed to address the needs of applications with complex requirements and time execution constraints (e.g. computer integrated manufacturing). However, no c...
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Indexing schemes for traditional object-oriented databases (OODBs) are divided into two catalogues: class hierarchy indexing and nested indexing. Since most of these systems are static in nature, dynamic operations li...
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Recently, construction of physical maps based on YAC and cosmid contigs has become increasingly common, since these maps serve as a fine-scale ordering basis for gene searches. We describe a combination of visualizati...
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