Moscow State University
Department of Computational Mathematics and Cybernetics
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Master level course
Object Databases
Professor Leonid A. Kalinichenko
General Description Of The Course
The course is devoted to database object modeling related to the
interoperation technologies and heterogeneous database integration.
Object models and object-relational models are considered according to
the database standards (such as ODMG 3.0 and SQL1999). Object Database
Management Group (ODMG) object model is considered in details. Basic
notions of object-relational models are introduced. Main concepts of
three object database manifestos are considered and compared.
Distributed heterogeneous database systems integration and
interoperability are considered. Canonical object model for
heterogeneous multidatabase integration systems is presented.
Significant part of the course is devoted to the issues of the uniform
representation of heterogeneous database models in a canonical
paradigm. Such representation is required in process of the
semantically integrated information system design. The approaches are
given in frame of the denotational semantics as well as in frame of
formal specification models and the concept of refinement.
Subject mediator infrastructure is considered as an advanced
technology of heterogeneous multidatabase integration. The mediator's
layer is introduced to provide the users with the metainformation
uniformly characterizing subject definitions in the canonical
information model. This model is needed to express the structure and
semantics of a subject domain and to map into this model heterogeneous
information resources preserving information and operations. The
canonical information model for the mediator, a technique for
information resources semantic registration in the mediator and query
rewriting technique is overviewed.
Optional part of the course is devoted to the modern issues of
component-based development of workflows treated as interactive types.
An overview of the workflow models is given. The canonical workflow
model is outlined. An approach for mapping of heterogeneous workflow
models to the common paradigm is considered. Finally, an approach for
workflow design based on reuse of pre-existing workflow specifications
is given.
Structure of the course
Basic concepts: subtype and type composition
Object database manifestos
Propositions of the third (object-relational) manifesto and their analysis
ODMG object database standard
- ODMG standard history
- Middleware and ODBMS
- Types and objects in ODL of ODMG 3.0
- Attributes and relationships
- Structured objects and literals
- Comparison with the OMG model
- ODMG object query language
SQL1999 standard overview
- Abstract data types in SQL 1999
- Objects, object tables and reference types
- Operation execution over the object tables
Canonical Object Model
- Purposes of the canonical model
- Object model concepts, frame system
- Type system
- Class representation facilities
- Assertion specifications
- Information resource specification modules
- Object calculus formulas
Data model mapping technique
- Data model mapping issues
- Data metamodels (denotational semantics, AMN as the metamodel)
- An approach for heterogeneous data models integration
- Commutative data model mapping construction
- Mapping of the network data model into extended relational one
Subject mediation for object database integration
- Information resources registration at the subject mediator
- Query rewriting principles
- Mediation architecture
A Uniform Script-Based Multiactivity Framework
- Basic notions of workflows
- Script types as canonical specification model for the workflow-like behaviour
- Homogenizing specification of various kinds of dynamic behaviour
- Capturing of structural aspects of multiactivity modeling
- Mapping of pre-existing workflow specifications into the canonical model
Workflow Component-Based Design
- Basic notions of process algebras, bisimulation
- Script processes and refinement of scripts
- Script type reducts and conformances
- Process of script design with reuse
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