Accessibility to Instances Regardless of Versions in Schema Evolution Environments in Object-Oriented Databases


The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 6, No. 3, pp. 553-561, Mar. 1999
10.3745/KIPSTE.1999.6.3.553,   PDF Download:

Abstract

The facility of schema evolution is necessary in object-oriented database applications. There exist several versions of schema and instances created under different versions of the schema cocurrently in the database. This paper proposes a mechanism for supporting accessing instances regardless of versions of the schema in schema evolution environments in object oriented databases. There is trade-off between the flexibility of schema modification operations and the system overhead for supporting such schema modifications. Access handling routines are provided to the underfined attributes in each version of the class. Access handling routines are also defined for each pair of semantics rather than defining backdate/update functions for each pair of versions of a class. Thus, this mechanism supports the change of semantics with reduced user and system ovehead.


Statistics
Show / Hide Statistics

Statistics (Cumulative Counts from September 1st, 2017)
Multiple requests among the same browser session are counted as one view.
If you mouse over a chart, the values of data points will be shown.


Cite this article
[IEEE Style]
J. Min, "Accessibility to Instances Regardless of Versions in Schema Evolution Environments in Object-Oriented Databases," The Transactions of the Korea Information Processing Society (1994 ~ 2000), vol. 6, no. 3, pp. 553-561, 1999. DOI: 10.3745/KIPSTE.1999.6.3.553.

[ACM Style]
Jin Min. 1999. Accessibility to Instances Regardless of Versions in Schema Evolution Environments in Object-Oriented Databases. The Transactions of the Korea Information Processing Society (1994 ~ 2000), 6, 3, (1999), 553-561. DOI: 10.3745/KIPSTE.1999.6.3.553.