Design and Implementation of an Instance Access Handling System for Supporting Schema Evolution 


Vol. 7,  No. 12, pp. 3753-3761, Dec.  2000
10.3745/KIPSTE.2000.7.12.3753


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  Abstract

There exist several versions of schema and instances created under different versions of the schema concurrently in the database in schema evolution environments. This paper proposes a mechanism for accessing instances regardless of versions in schema evolution environments in object-relational databases. Access handling routines are used in accessing to the instances through the undefined attributes in the versions in which they were created. The change of semantic information of attributes is supported. Access handling routines are defined for each pair of semantics rather than defining backdate/update functions for each pair of versions of a class. A query language that accommodates version and semantic information is defined through the extension of the primitive SQL format.

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[IEEE Style]

M. Jin and B. J. Kim, "Design and Implementation of an Instance Access Handling System for Supporting Schema Evolution," The Transactions of the Korea Information Processing Society (1994 ~ 2000), vol. 7, no. 12, pp. 3753-3761, 2000. DOI: 10.3745/KIPSTE.2000.7.12.3753.

[ACM Style]

Min Jin and Bong Jin Kim. 2000. Design and Implementation of an Instance Access Handling System for Supporting Schema Evolution. The Transactions of the Korea Information Processing Society (1994 ~ 2000), 7, 12, (2000), 3753-3761. DOI: 10.3745/KIPSTE.2000.7.12.3753.

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