Chapter 2: DDBMS Architecture - Free University of Bozen

Chapter 2: DDBMS Architecture - Free University of Bozen

30 Pages · 2009 · 555 KB · English

• Conceptual schema: Provides enterprise view of entire database RELATION EMP [KEY = {ENO} ATTRIBUTES = • Different types of client/server architecture

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Chapter 2: DDBMS Architecture  Denition of the DDBMS Architecture  ANSI/SPARC Standard  Global, Local, External, and Internal Schemas, Example  DDBMS Architectures  Components of the DDBMS Acknowledgements: I am indebted to Arturas Mazeika for providing me his slides of this course. DDB 2008/09 J. Gamper Page 1 Denition Architecture: The architecture of a system denes its structure: – the components of the system are identied; – the function of each component is specied; – the interrelationships and interactions among the compone nts are dened.  Applies both for computer systems as well as for software syst ems, e.g, – division into modules, description of modules, etc. – architecture of a computer  There is a close relationship between the architecture of a s ystem, standardisation efforts, and a reference model. DDB 2008/09 J. Gamper Page 2 Motivation for Standardization of DDBMS Architecture DDBMS might be implemented as homogeneous or heterogeneous D DBMS  Homogeneous DDBMS – All sites use same DBMS product – It is much easier to design and manage – The approach provides incremental growth and allows increa sed performance  Heterogeneous DDBMS – Sites may run different DBMS products, with possibly differen t underlying data models – This occurs when sites have implemented their own databases rst, and integration is considered later – Translations are required to allow for different hardware a nd/or different DBMS products – Typical solution is to use gateways A common standard to implement DDBMS is needed! DDB 2008/09 J. Gamper Page 3 Standardization The standardization efforts in databases developed refere nce models of DBMS.  Reference Model : A conceptual framework whose purpose is to divide standard ization work into manageable pieces and to show at a general level how these pieces are related to each other.  A reference model can be thought of as an idealized architectural modelof the system.  Commercial systems might deviate from reference model, sti ll they are useful for the standardization process  A reference model can be described according to 3 different a

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