Development of an assertion model of integrity constraints in object-oriented databases
Object-Oriented Databases (OODBs) have been designed to support large and complex programming projects. The data accuracy, consistency, and integrity in OODBs are extremely important for developers and users. Checking the integrity constraints in OODBs is a fundamental problem in database design...
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| フォーマット: | 学位論文 |
| 言語: | English English |
| 出版事項: |
2006
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| 主題: | |
| オンライン･アクセス: | http://psasir.upm.edu.my/id/eprint/8714/1/FSKTM_2006_11%20IR.pdf http://psasir.upm.edu.my/id/eprint/8714/ |
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| 要約: | Object-Oriented Databases (OODBs) have been designed to support
large and complex programming projects. The data accuracy,
consistency, and integrity in OODBs are extremely important for
developers and users. Checking the integrity constraints in OODBs is
a fundamental problem in database design. Existing OODB
Management Systems (OODBMSs) lack to a capability of an ad-hoc
declarative specification of enforcing and maintaining integrity
constraints that are appeared among attributes in association,
composition, and inheritance hierarchies' relationships.
A critical problem in the existing OODBs is that they cannot support
User-Defmed Constraints (UDCs) that can be defmed in classes with
composition (logical or physical composition) and inherence (single or
mUltiple inheritance) hierarchies. Integrity constraints in the current OODBMSs are maintained either by disallowing and rolling back
transaction or modifying operations that may produce a violation.
The constraints must be maintained in the backward direction along
the class composition hierarchy as well as in the forward direction.
In this work an Assertion Model of Integrity Constraints (AMIC) is
proposed. The AMIC keeps the derivation path along with the
attributes' relationships that are derived from association,
composition, and inheritance hierarchies. The AMIC techniques are
designed to implement the needed functions that are collecting the
attributes' relationships and checking the integrity constraints.
Moreover, AMIC keeps UDCs with their relationships in both single
classes and multilevel classes (intra-class and inter-class).
Furthermore, the AMIC can maintain constraints in a single object
and a set of distributed objects (intra-object and inter-object).
Therefore, this makes the new model extendable and can be
integrated with any existing constraints' service.
A new technique called Detection Method (DM) isdesigned to check
the Object Meta Data (OMD) to detect the constraints violation before
it occurs. The AMIC is designed for both Centralized Integrity
Maintenance (CIM) and Application-Oriented Integrity Maintenance
(AOIM). The AMIC can also enforce and maintain structural and
logical integrity constraints, in addition to enforce and maintain
redundant, inconsistent, and duplicate constraints. |
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