Elmasri, R., Navathe, S. B., Fundamentals of Database Systems, The Benjamin/Cummings Publishing Company, Inc. (1994)  Home/Search   Document Not in Database   Summary   Related Articles   Check

....DBMSs are monolithic, i.e. the DBMS software system is a black box. The functionality offered is generally fixed and non extensible. This rigid assumption has motivated researchers to look into an extensible architecture for rapid development of DBMSs. As can be found in Elmasri and Navathe [3], the GENESIS and EXODUS projects were developed based on this approach. The idea of plugcompatible software modules was further exemplified by the PROBE and STARBURST (also in [3] The underlying motivation was to provide a set of software building blocks for the users to compose tailored DBMSs ....

....to look into an extensible architecture for rapid development of DBMSs. As can be found in Elmasri and Navathe [3] the GENESIS and EXODUS projects were developed based on this approach. The idea of plugcompatible software modules was further exemplified by the PROBE and STARBURST (also in [3]) The underlying motivation was to provide a set of software building blocks for the users to compose tailored DBMSs by selecting the required functionality. Development of the proposed services relies on implementing the active model to provide information sharing and processing services ....

Elmasri, R. and Navathe, S., Fundamentals of Database Systems (second edition), The Benjamin/Cummings Publishing Company, Inc., 1994.

....fact was stored in the University s database and when it was stored in the departmental database. ut The ability to have multiple transaction times fits in well with temporal specialization. The concepts of specialization and generalization have been used previously within data modeling (e.g. EN89, HM81, SS77] A subclass may be created from a class by means of specialization, i.e. by making the defining properties (the intension) of the class more restrictive and thus also restricting the set of examples (the extension) of the class. As the dual, a superclass may be created from a class ....

R. Elmasri and S. B. Navathe. Fundamentals of Database Systems. The Benjamin /Cummings Publishing Company, Inc., 1989.

....(so may be uniform) A,#) can be e#ectively enforced by some edit automaton. Proof See Appendix A. 6.4 An Example: Transactions To demonstrate the power of our edit automata, we show how to implement the monitoring of transactions. The desired properties of atomic transactions [EN94] commonly referred to as the ACID properties, are atomicity (either the entire transaction is executedornopartofitisexecuted) consistency preservation (upon completion of the transaction the system must be in a consistent state) isolation (the e#ects of a transaction should not be visible to ....

Ramez Elmasri and Shamkant B. Navathe. Fundamentals of database systems. The Benjamin/Cummings Publishing Company, Inc., 1994.

....modes Activation modes make it possible to specify the rule activation point with respect to event occurrence and transaction execution. A transaction is a work unit composed of one or more operations (methods) on the database. A transaction assures atomicity, coherence, isolation and durability [EN89]. There are two activation modes: immediate and deferred. In the Immediate mode, rules are activated in the current transaction once the event occurs. On the contrary, in the Deferred activation mode, rules are activated after the validation of the current transaction. In this case, each rule ....

R. Elmasri and S. Navathe. Fundamentals of Database Systems. the Benjamin Cummings Publishing Company, 1989.

....transfer cost. 7.3.2. Source Call Ordering Results for Artificial Sources Below we present results from the performance evaluation of HT, BE and RA algorithms for queries over sources mimicking Internet sources. We derived the sources from the relations present in the Enterprise Schema used in [13]. The sources are designed as Java servlets accessible from a server on the Intranet. The servlets accept a query and return relevant tuples extracted from data stored in flat files. To model the latency exhibited by Internet sources, we delay the response from the servlets. The delay is ....

R. Elmasri and S.B. Navathe. Fundamentals of Database Systems. The Benjamin /Cummings Publishing Company, Inc., 2nd edition, 1994.

....no constraints on the set of possible executions (so may be uniform) edit automaton. Proof See Appendix A. 6.4 An Example: Transactions To demonstrate the power of our edit automata, we show how to implement the monitoring of transactions. The desired properties of atomic transactions [EN94] commonly referred to as the ACID properties, are atomicity (either the entire transaction is executed or no part of it is executed) consistency preservation (upon completion of the transaction the system must be in a consistent state) isolation (the e#ects of a transaction should not be ....

Ramez Elmasri and Shamkant B. Navathe. Fundamentals of database systems. The Benjamin/Cummings Publishing Company, Inc., 1994.

....update a different set of plant variables. When the updates are crucial, the transactions need to adhere to the serializability and correctness issues. Updates of status information such as sensor values are independent of the current value of the data object. These updates are called blind writes [EN94]. The isolation level for the transactions depend on the nature of the update or read. Depending on the requirements and functionality, transactions of lower degrees of isolation can be used to increase concurrency [GR93] For example, a transaction collecting statistics may be permitted to read ....

....associations A qualified association relates two object classes and a qualifier. The qualifier partitions the set of related objects into disjoint subsets, the subsets comprising of one or more objects. This relationship is analogous to the weak entity set relationship in relational design [EN94]. For example, every product design comprises of several drawings. A drawing name is unique for the design, but may be reused in other designs. In other words, the objects of the Drawings class are uniquely identified by the drawing sheet number and the design to which they belong. The sheet ....

R. Elmasri and S. Navathe, Fundamentals of Database Systems , The Benjamin/Cummings Publishing Company, Inc., 1994.

....is more suitable. 2.4 Overview of KERMIT KERMIT (Knowledge based Entity Relationship Modelling Intelligent Tutor) is a constraint based tutor developed as a problem solving environment for database design. The system is based on the entity relationship (ER) conceptual data model as described in [EN94]. KERMIT is intended to complement traditional instruction. It assumes students are familiar with the ER design model. KERMIT is an intelligent tutor in that it maintains models of each student, facilitating the ability to provide individualised pedagogical instruction. 2.4.1 The Architecture of ....

Ramez Elmasri and Shamkant B Navathe. Fundamentals of Database Systems.The Benjamin/Cummings Publishing Company, Inc., 1994.

....conceptual representation. It is a set of concepts that can be used to describe the structure of a database. By the structure of a database we mean the data types, relationships, and constraints that should hold on the data. It can also include a set of operations for database retrieval and update [10]. Definition 2. An Image Database (IDB) is a logically coherent collection of images with some inherent meaning. The images usually belong to a specific application domain. An IDB is designed, built, and populated with images for specifics purpose and represents some aspects of the real world. ....

Elmasri R., Navathe S.: Fundamentals of Database Systems. The Benjamin/Cummings Publishing Company (1994)

....describe a particularly important application, the implementation of transactions policies, in the following section. 3.4 An Example: Transactions To demonstrate the power of our edit automata, we show how to implement the monitoring of transactions. The desired properties of atomic transactions [EN94], commonly referred to as the ACID properties, are atomicity (either the entire transaction is executed or no part of it is executed) consistency preservation (upon completion of the transaction the system must be in a consistent state) isolation (the e#ects of a transaction should not be ....

Ramez Elmasri and Shamkant B. Navathe. Fundamentals of database systems. The Benjamin /Cummings Publishing Company, Inc., 1994.

....opinion, for next generation time oriented systems in medicine. Adoption of advanced data models. The adoption of advanced data models, such as the object oriented data model and the EER data model, will improve the capability of describing real world clinical entities at high abstraction levels [89, 90, 91, 92]. Thus, the focus may shift to more domain specific inference actions. Maintenance of clinical raw data and abstractions. Several recent systems allow not only the modeling of complex clinical concepts at the database level, but also the maintenance of certain inference operations at that level. ....

Elmasri R., Navathe S. Fundamentals of Database Systems, 2nd Edition. The Benjamin/Cummings Publishing Company, Redwood City, CA, 1994.

....tra c for RPC systems. None of them integrate their mechanisms with data migration. In addition, protection between a client and server is important in their systems; in my research it is not an issue. Research of a similar flavor also occurs in query optimization for distributed databases [33]. The primary distinction between databases and distributed shared memory systems is that the amount of data being accessed is much larger; instead of small region based accesses, accesses take the form of queries over relations or whole databases. The result is that query optimization ....

R. Elmasri and S.B. Navathe. Fundamentals of Database Systems. The Benjamin/Cummings Publishing Company, Inc., Redwood City, CA, 1989.

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Ramez Elmasri and Navathe ShamkantB. Fundamentals of Database Systems. The Benjamin/Cummings Publishing Company, Inc., California, 1989.

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Ramez Elmasri and Shamkant Navathe. Fundamentals of Database Systems. The Benjamin /Cummings Publishing Company, 1989.

....relations to allow for the elimination of redundancy. In addition to eliminating redundant information, the database schema has to more clearly (i) factor basic entity (or object) types from relationship types (for a semiformal introduction to the entity relationship conception of databases see [Elmasri and Navathe 1989]) and (ii) make the distinction explicit in its postulation of relations and index attributes used to relate entity types to each other in order to allow for variable logical views on the data. Another important issue in the refinement of the data model is the representation of list or ....

Ramez Elmasri and Shamkant B. Navathe. Fundamentals of Database Systems. Redwood City, California (The Benjamin /Cummings Publishing Company), 1989.

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Elmasri, R., Navathe, S. B., Fundamentals of Database Systems, The Benjamin/Cummings Publishing Company, Inc. (1994)

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Ramez Elmasri and Shamkant B. Navathe. Fundamentals of Database Systems. Redwood City, California (The Benjamin/Cummings Publishing Company), 1989.

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R.ElmasriandS.B.Navathe. Fundamentals of Database Systems. The Benjamin/Cummings Publishing Company, INC, 2. edition, 1994. ISBN 0-8053-1753-8.

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R. Elmasri and S.B. Navathe, Fundamentals of Database Systems, 2nd ed., Benjamin/Cummings Publishing Company, Redwood City, Calif., 1994, pp. 555-572.

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R. Elmasri and S. B. Navathe. Fundamentals of Database Systems. Second Edition. The Benjamin/Cummings Publishing Company, Inc. ISBN 0--8053--1748--1, 1994.

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R. Elmasri and S. B. Navathe, Fundamentals of Database Systems, 2 nd edition, Benjamin/Cummings Publishing Company, California, 1994, Chapter 8.

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Ramez Elmasri and Shamkant B. Navathe. Fundamentals of database systems. The Benjamin/Cummings Publishing Company, Inc., 1994.

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Elmasri R. and Navathe S. B., Fundamentals of Database Systems (second edition). The Benjamin/Cummings Publishing Company, ISBN 0-8053-1753-8, 1994.

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Elmasri, R., Navathe, S. B., Fundamentals of Database Systems, The Benjamin/Cummings Publishing Company, Inc. (1994)

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R. Elmasri and S. Navathe, Fundamental of Database Systems, second edition, Benjamin Cummings Publishing Company, 1994.

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