Xem 1-20 trên 64 kết quả Varieties of databases
  • Computer Science is defined in different ways by different authors. Wikipedia (http://en.wikipedia.org/ wiki/Computer_science) defines computer science as the collection of a variety of disciplines related to computing, both theoretical and practical: theoretical foundations of information and computation, language theory, algorithm analysis and development, implementation of computing systems, computer graphics, databases, data communications, et

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  • Abstract. The work reported in this article continues investigations in a theoretical framework for Concept Theories based on mathematical logic. The general idea is that the intension of a concept is defined by some equivalence class of theories, whereas the extension is given by the models of the theory. The fact that extensions depend on structures that are necessary to interpret the formulae of the logic, already provides an argument to put more emphasis on the intension.

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  • The Oracle OLAP option is a full-featured on-line analytical processing (OLAP) server embedded within the Oracle Database. The Oracle OLAP option can be used to improve SQL- based business intelligence tools and applications by improving query performance and enriching them with analytic content. As an OLAP solution that is deeply embedded in the Oracle Database, the Oracle OLAP option allows centralized management of data and business rules in a secure, scalable and enterprise-ready platform..

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  • Pursuant to the provision of the Privacy Act of 1974, HUD is providing notice of its formal adoption of a new system of records for the Office of General Counsel (OGC) EDiscovery Management System (EDMS). The OGC discovery productions typically require the preservation, collection and analysis of massive emails, word processing documents, PDF files, spreadsheets, presentations, database entries, and other documents in a variety of electronic file formats, as well as paper records.

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  • SAP2000 represents the most sophisticated and user-friendly release of the SAP series of computer programs. When initially released in 1996, SAP2000 was the first version of SAP to be completely integrated within Microsoft Windows. It features a powerful graphical user interface that is unmatched in terms of ease-of-use and productivity. Creation and modification of the model, execution of the analysis, and checking and optimization of the design, and production of the output are all accomplished using this single interface.

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  • This chapter describes how to control concurrent execution in a database, in order to ensure the isolation properties of transactions. A variety of protocols are described for this purpose. This chapter presents the following content: Lock­based protocols, timestamp­based protocols, validation­based protocols, multiple granularity,...

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  • This chapter covers failure models and a variety of failure recovery techniques. Re-covery in a real-life database systems supporting concurrent transactions is rather complicated. To help the student understand concepts better, the chapter presents re-covery models in increasing degree of complexity. The chapter starts with a simple model for recovery, ignoring the issue of concurrency. Later, the model is extended to handle concurrent transactions with strict two-phase locking.

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  • This chapter describes the process by which queries are executed efficiently by a database system. Query processing refers to the range of activities involved in extracting data from a database. The activities include translation of queries in high-level database languages into expressions that can be used at the physical level of the file system, a variety of query-optimizing transformations, and actual evaluation of queries.

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  • Chapter 18 - Parallel databases. In this chapter, on parallel databases, explores a variety of parallelization techniques, including I/O parallelism, interquery and intraquery parallelism, and interoperation and intraoperation parallelism. The chapter also describes parallel-system design.

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  • Welcome to the exciting world of Oracle databases. Oracle is widely acknowledged as the most popular database software in the world today. It finds its roots in relational database theory conceived by E. F. Codd in the 1950s, and extends those theories into an infinite variety of directions, such as data warehousing, online transaction processing, and Webenabled applications. Undoubtedly, the popularity of this software is part of the reason you are reading this book.

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  • SQL*Plus is an environment in which you can  Execute SQL statements to retrieve, modify, add, and remove data from database tables.  Format, perform calculations on, store, and print query results in the form of reports.  Issue SQL statements to create, alter, and remove database tables.  Create anonymous blocks, subprograms, database triggers using procedural language extension, PL/SQL. SQL*Plus has a variety of commands you need to use to execute subprograms, pass values in and out of PL/SQL blocks, and debug your code.

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  • This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use.

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  • Lieber, P. Yang, and Z.L. Wang in USA by the end of 90’s, successful demonstration of such a large variety of functional devices has lead to a rapidly growing interest in nanowire researches around the world and to a steep increase in the number of annual publications (the ISI-Thomson ‘Web of Science’ database reports over 800 papers published in the year 2009 under the combined keywords ‘nanowires & semiconductors’).

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  • In this lesson, you will see how views can be used to present data to users in a variety of ways. In addition, you will see how integrity constraints can be enforced, if using a view to insert, update, or delete data. At the end of this lesson, you should be able to  Explain the concept of a view.  Use data dictionary views.  Create simple and complex views.  Create a view with an option to enforce constraints.  Modify a view.  Remove a view.

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  • In the 1970s, IBM developed a product called SEQUEL, or Structured English Query Language, which ultimately became SQL, the Structured Query Language. IBM, along with other relational database vendors, wanted a standardized method for accessing and manipulating data in a relational database. Over the decades, many competing languages have allowed programmers and developers to access and manipulate data. However, few have been as easy to learn and as universally accepted as SQL.

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  • JSP offers a number of advantages over other server−side scripting languages − as you've already seen, performance is just one of them. And this performance edge becomes particularly important when you combine it with another important benefit − the ability to seamlessly connect to a variety of database servers.

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  • SQL Server 2000 Programming by Example provides clear and concise examples of basic programming techniques used in SQL Server 2000 primarily using Transact-SQL. Even if you're a complete novice to SQL Server 2000 programming, you will benefit by reading through the book's logical process. SQL Server 2000 is introduced and explored, database structure is designed and built, and finally a variety of programming techniques are studied and reviewed.

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  • In this complete revision and expansion of his first SQL Puzzles book, Joe Celko challenges you with his trickiest puzzles-and then helps solve them with a variety of solutions and explanations. Joe demonstrates the thought processes that are involved in attacking a problem from an SQL perspective to help advanced database programmers solve the puzzles you frequently face. These techniques not only help with the puzzle at hand, but help develop the mindset needed to solve the many difficult SQL puzzles you face every day. Of course, part of the fun is to see whether or not you can write...

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  • We now turn to the potential benefits of having a more accurate estimate of Chemical A's true cost. As described above, this requires knowledge of the firm's ability to change its actions in response to better information. If the disposal cost X of Chemical A is revealed to be significant, how might the firm respond? This is a question that hinges primarily on the firm's technological options and the availability of substitute inputs. Substitutes can take a variety of forms.

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  • Before using the “EDORA cube” to provide a framework for a “broad-brush” review of socio- economic performance across “non-urban” Europe (section 3) it will be helpful to provide a simple statistical assessment of the “independence” of the D-P and Structural types. The distinctiveness of the types may be assessed in a variety of different ways. For example the statistical differences between the types of each typology may be tested on the basis of the indicators used in the classification.

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