J.F. Roddick. A Model for Schema Versioning in Temporal Database Systems. In Proc. 19th. ACSC Conf., pages 446--452, 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....be attributed, at least in part, to the technical difficulty of introducing temporal extensions into relational databases and object oriented databases. Schema changes represent a particularly difficult and important problem for modern information systems, which need to be designed for evolution [20, 19, 13]. Meanwhile, there is much current interest in publishing and viewing database resident data as XML documents. In fact, such XML views of the database can be easily visualized on web browsers and processed by web languages, including powerful query languages such as XQuery [2] The definition of ....

....schema versioning [19] is a weaker concept compared to schema versioning, where data stored under any historical schema can be viewed through any other schema, but updates can only be issued through the current schema. A model for schema versioning in temporal database systems is discussed in [20], where an extension to temporal data models is proposed to support partial schema versioning. Schema evolution is also a very important issue for object oriented DBMS and has been implemented in commercial OODBMSs such as O2 [13] Publishing Relational Databases in XML. There is much current ....

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J.F. Roddick. A model for schema versioning in temporal database systems. In Proc. 19th. ACSC Conf., pages 446-- 452, 1996.

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Roddick, J.F. A model for schema versioning in temporal database systems. Aust. Comput. Sc. Commun., 18(1):446-452. 1996.

....Firstly, the concepts of a completed schema was developed following the ideas of Clifford and Warren [6] for a completed relation to enable all data, regardless of time of validity, to be accessed. The concept of a completed schema, which was introduced in [19] and discussed in more detail in [22], is an overarching schema through which all data, regardless of time of validity or format, to be retrieved. The completed schema (discussed in more detail later) is defined as the minimal superset of relevant schemata capable of holding all associated data without loss. Secondly, three ....

....we degrade to schema versioning (in spacetime) Furthermore, if time only is supplied the model degrades to conventional temporal schema versioning ( a la [20] As we would want, the limit case is degradation to no versioning. The model embraces the concept of a completed schema introduced in [22] which is constructed as the minimal schema capable of holding all associated data without loss. More precisely, a completed relation scheme C of a relation scheme R contains the minimal union of all explicit attributes which have been defined during the relevant spatio temporal span of the ....

Roddick, J.F. A model for schema versioning in temporal database systems. Aust. Comput. Sc. Commun., 18(1):446-452. 1996.

....[22] Firstly, the concept of a completed schema was developed following the ideas of Cli ord and Warren [7] for a completed relation to enable all data, regardless of time of validity, to be accessed. The concept of a completed schema, which was introduced in [21] and discussed in more detail in [23], is that of an overarching schema through which all data, regardless of time of validity, format or semantics, can be retrieved. The completed schema (discussed in more detail later) is de ned as the minimal superset of relevant schemata capable of holding all associated data without loss. ....

....we degrade to schema versioning (in space time) Furthermore, if time only is supplied the model degrades to conventional temporal schema versioning ( a la [26] As we would want, the limit case is degradation to no versioning. The model embraces the concept of a completed schema discussed in [23] which is constructed as the minimal schema capable of holding all associated data without loss. More precisely, a completed relation scheme C of a relation scheme R contains the minimal union of all explicit attributes which have been de ned during the relevant spatiotemporal span of the ....

Roddick, J.: 1996, `A model for schema versioning in temporal database systems'. Australian Computer Science Communications 18(1), 446-452.

....Firstly, the concepts of a completed schema was developed following the ideas of Clifford and Warren [6] for a completed relation to enable all data, regardless of time of validity, to be accessed. The concept of a completed schema, which was introduced in [20] and discussed in more detail in [23], is an overarching schema through which all data, regardless of time of validity or format, to be retrieved. The completed schema (discussed in more detail later) is defined as the minimal superset of relevant schemata capable of holding all associated data without loss. Secondly, three ....

....we degrade to schema versioning (in space time) Furthermore, if time only is supplied the model degrades to conventional temporal schema versioning (a la [21] As we would want, the limit case is degradation to no versioning. The model embraces the concept of a completed schema introduced in [23] which is constructed as the minimal schema capable of holding all associated data without loss. More precisely, a completed relation scheme C of a relation scheme R contains the minimal union of all explicit attributes which have been defined during the relevant spatiotemporal span of the ....

Roddick, J.F. A model for schema versioning in temporal database systems. Aust. Comput. Sc. Commun., 18(1):446-452. 1996.

No context found.

J.F. Roddick. A Model for Schema Versioning in Temporal Database Systems. In Proc. 19th. ACSC Conf., pages 446--452, 1996.

No context found.

J.F. Roddick. A model for schema versioning in temporal database systems. In Proc. 19th. ACSC Conf., pages 446-- 452, 1996.

No context found.

J.F. Roddick. A model for schema versioning in temporal database systems. In Proc. 19th. ACSC Conf., pages 446--452, 1996.

No context found.

J.F. Roddick. A model for schema versioning in temporal database systems. In Proc. 19th. ACSC Conf., pages 446-- 452, 1996.

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