Xem 1-20 trên 1223 kết quả Database system
  • Database management has evolved from a specialized computer application to a central component of a modern computing environment, and, as a result, knowl- edge about database systems has become an essential part of an education in com- puter science. In this text, we present the fundamental concepts of database manage- ment. These concepts include aspects of database design, database languages, and database-system implementation.

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  • Databases and database systems are an essential component of life in modern society: most of us encounter several activities every day that involve some interaction with a database. For example, if we go to the bank to deposit or withdraw funds, if we make a hotel or airline reservation, if we access a computerized library catalog to search for a bibliographic item, or if we purchase something online—such as a book, toy, or computer— chances are that our activities will involve someone or some computer program accessing a database.

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  • In Ebook Principles of Distributed Database Systems defines the fundamental concepts and set the framework for discussing distributed databases. We start by examining distributed systems in general in order to clarify the role of database technology within distributed data processing, and then move on to topics that are more directly related to DDBS.

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  • Tham khảo tài liệu 'database systems - part 12', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tham khảo tài liệu 'database systems - part 11', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • For a natural language access to database system to be practical it must achieve a good match between the capabilities of the user and the requirements of the task. The user brings his own natural language and his own style of interaction to the system. The task brings the questions that must be answered and the database domaln+s semantics. All natural language access systems achieve some degree of success. But to make progress as a field, we need to be able to evaluate the degree of this success. For too long, the best we have menaged has been to...

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  • Database System: Chapter 9 - Disk Storage and Indexing Structures for Files presents about Disk Storage Devices (Preferred secondary storage device for high storage capacity and low cost, Data stored as magnetized areas on magnetic disk surfaces,...), Files of Records, Indexing Structures for Files.

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  • Do natural language database systems still ,~lovide a valuable environment for further work on n~,tural language processing? Are there other systems which provide the same hard environment :for testing, but allow us to explore more interesting natural language questions? In order to answer , o to the first question and yes to the second (the position taken by our panel's chair}, there must be an interesting language problem which is more naturally studied in some other system than in the database system. ...

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  • Ebook "Database System Concepts" present on: Relational databases, database design, data storage and querying, transaction management, system architecture, data warehousing, data mining, and information retrieval,...

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  • Database System: Chapter 1 - Introduction presents about File based approach, Database approach, Basic definitions, Database systems concepts (Data model, Three schema architecture – Data independence, DBMS languages, Classification of DBMS, Database users).

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  • Database System: Chapter 2 - The Relational Data Model & SQL includes about Relational Model Concepts, Relational Model Constraints and Relational Database Schemas, Update Operations and Dealing with Constraint Violations, Basic SQL.

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  • Database System: Chapter 4 - The Relational Algebra and Calculus presents about Relational Algebra (Unary Relational Operations, Relational Algebra Operations From Set Theory, Binary Relational Operations, Additional Relational Operations, Examples of Queries in Relational Algebra); Relational Calculus.

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  • Database System: Chapter 5 - Data Modeling Using the (Enhanced) Entity-Relationship (E-ER) Model provides about Example Database Application (COMPANY), ER Model Concepts, ER Diagrams - Notation, ER Diagram for COMPANY Schema, Enhanced Entity Diagram.

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  • Database System: Chapter 6 - Relational Database Design by ER and EERR-to-Relational Mapping presents about ER-to-Relational Mapping Algorithm, Mapping EER Model Constructs to Relations (Options for Mapping Specialization or Generalization, Mapping of Union Types (Categories).

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  • Database System: Chapter 7 - Functional Dependencies includes Informal Design Guidelines for Relational Databases (Semantics of the Relation Attributes, Redundant Information in Tuples and Update Anomalies, Null Values in Tuples, Spurious Tuples), Functional Dependencies (FDs).

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  • Database System: Chapter 8 - Normalization for Relational Databases includes Normal Forms Based on Primary Keys (Normalization of Relations, Practical Use of Normal Forms, Definitions of Keys and Attributes Participating in Keys,...), General Normal Form Definitions (For Multiple Keys), BCNF (Boyce-Codd Normal Form).

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  • Database System: Chapter 10 - Query Processing and Optimization Introduction to Query Processing, Translating SQL Queries into Relational Algebra, Translating SQL Queries into Relational Algebra, Using Selectivity and Cost Estimates in Query Optimization, Overview of Query Optimization in Oracle.

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  • Database System: Chapter 11 - Database Security An Introduction presents about Introduction to Database Security Issues (DB security is a broad area, Threats to databases, Fundamental data security requirements), Discretionary Access Control, Mandatory Access Control.

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  • Database Systems: Lecture 1 - Database System Concepts and Architecture presents about File-based Approach, Database Approach, Three-Schema Architecture and Data Independence, Database Languages, Data Models, Database Schema and Database State, Data Management Systems Framework.

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  • Database Systems: Lecture 2 - Entity-Relationship Model includes What is ER Model? And Why? Overview of Database Design Process, Example COMPANY Database, ER Model Concepts, ER Diagram, Alternative Diagrammatic Notations, Problems with ER Models.

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