DATABASE SYSTEMS (phần 14) potx

... (see Chapter 6). Practical Database Design and Tuning In this chapter, we first discuss the issues that arise in physical database design in Section 16.1. Then, we discuss how to improve database performance through database tuning in Section ... undertaking physical database design, we must have a good idea of the intended use of the database by defining the queries and transacti...

Ngày tải lên: 07/07/2014, 06:20

... in a database. Because part of the theoretical foundation for some deductive database systems is mathematical logic, such rules are often referred to as logic databases. Other types of systems, ... in the application programs that access the database. Section 24.3 will give a brief overview of spatial and multimedia databases. Spatial databases provide concepts for databases that kee...

Ngày tải lên: 07/07/2014, 06:20

... types of distributed database systems, including federated and multidatabase systems and highlights the problems of heterogeneity and the needs of autonomy in federated database systems, which will ... retrieve the employee 25.7 Distributed Databases in Oracle I831 Net8 Database server Database server Net8 (c:::>c:::>c:::> = EMPtable t- , , Sales , database CONNECT T...

Ngày tải lên: 07/07/2014, 06:20

... created in SQL using the CREATE VIEW command. COP 4710: Database Systems (Day 18) Page 34 Mark Llewellyn An Example Database( +) COP 4710: Database Systems (Day 18) Page 24 Mark Llewellyn Right Outer ... attribute. ### ###  ...

Ngày tải lên: 21/01/2014, 18:20

... Analysis, Experimental Investigations and Industrial Systems Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems 534 pressure of 2-4 bar, (2) soft deposits, ... Analysis, Experimental Investigations and Industrial Systems Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems 514 5- Transport from the depos...

Ngày tải lên: 20/06/2014, 06:20

... of Phasor Measurement Units in the Adaptive Protection of Interconnected Systems Power Systems and Communication Systems Infrastructures for the Future. Beijing, Peoples Republic of China, ... of Phasor Measurement Units in the Adaptive Protection of Interconnected Systems Power Systems and Communication Systems Infrastructures for the Future. Beijing, Peoples Republic of Chin...

Ngày tải lên: 21/06/2014, 06:20

Ngày tải lên: 03/07/2014, 10:20

... using, and imple- menting database systems and applications. Our presentations stresses the fundamentals of database modeling and design, the languages and facilities provided by the database management systems, and system implementation techniques. The book is meant to be used ... I Chapter 1 Databases and Database Users DATABASE SYSTEM UserS/Programmers ~ Application Programs/...

Ngày tải lên: 07/07/2014, 06:20

... are becoming quite popular. These systems provide an environment for developing database applications and include facilities that help in many facets of database systems, including database design, CUI development, querying and ... processing and optimization, their performance improved. Eventually, relational databases became the dominant type of database systems for traditiona...

Ngày tải lên: 07/07/2014, 06:20

... additional facts from the facts stored in a database. Hence, whereas most current database systems are limited to answering direct queries, knowledge-based systems using KR schemes can answer queries that involve inferences over the stored ... relational database and a rela- tional database schema. A relational database schema S is a set of relation schemas S = (R I , R z , ,...

Ngày tải lên: 07/07/2014, 06:20