By Klaus R. Dittrich, Andreas Geppert
Part Database platforms is a suite of invited chapters through the researchers making the main influential contributions within the database industry's development towards componentizationThis ebook represents the sometimes-divergent, sometimes-convergent techniques taken by means of major database owners as they search to set up commercially manageable componentization techniques. jointly, those contributions shape the 1st e-book dedicated totally to the technical and architectural layout of component-based database platforms. as well as detailing the present country in their examine, the authors additionally take in some of the matters affecting the most likely destiny instructions of part databases.If you've got a stake within the evolution of any of brand new best database structures, this e-book will make attention-grabbing studying. it's going to additionally support arrange you for the know-how that's prone to develop into largely to be had over the following a number of years. * Is made out of contributions from the field's so much hugely revered researchers, together with key figures at IBM, Oracle, Informix, Microsoft, and POET.* Represents the full spectrum of techniques taken by means of best software program businesses engaged on DBMS componentization strategies.* Covers component-focused architectures, tools for hooking elements into an total process, and aid for part development.* Examines the part applied sciences which are most dear to Web-based and multimedia databases.* offers an intensive type and evaluation of part database structures.
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Additional info for Component Database Systems (The Morgan Kaufmann Series in Data Management Systems)
What this yields is tremendous ﬂexibility at acceptable levels of performance. Distributed ORDBMSs provide additional advantages. • ORDBMSs include elaborate metadata management facilities. These provide a global catalogue or directory describing the contents of the entire system; its data and logic. Unlike other distributed directory services, this can be accessed by using reporting tools and graphical query-creation software, rather than by using static applications or procedural code. • The logical data model and declarative query language mean that many high-level, conceptual operations can be expressed more or less directly in the system.
In a nutshell, a component is pushed between the DBMS and each data source. These components serve to homogenize differences in formats and functionality from the DBMS’s point of view. From the data sources’ perspective, they level the different data source capabilities to a common basis. Thus, each component mediates between the data sources and the DBMS, or—from the DBMS’s point of view—wraps the data source. , objects). Second, the mediation components must offer a common interface. This interface is used by the DBMS to request data from 24 | Component Database Systems: Introduction, Foundations, and Overview the data sources.
In which ﬁles) implementations can be found. , to create and retrieve instances of them). However, efﬁcient retrieval and processing might require further enhancements to the DBMS, particularly to the access path manager and the query optimizer. Thus, we observe that extending a DBMS by plugging in new components often has a sort of domino effect because other parts must be adapted accordingly. Current DBMSs typically contain B-tree access paths and possibly also hash-based indexes. B-trees can handle one-dimensional keys very well and rely on the orderability of keys.