FUNDAMENTALS OF DATABASE SYSTEMS Fourth Edition phần 3 ppt

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... result of the query, because the constraint that a relation is a set is not enforced. Figure 08.02(a) shows the result of query Q0 on the database of Figure 07.06. 1 Page 2 13 of 8 93 Strictly ... relational databases, users were less concerned about migrating their database applications from other types of database systems for example, network or hierarchical syste...

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... and Hashing 411 13. 1 Introduction 412 13. 2 Secondary Storage Devices 13. 3 Bufferingof Blocks 421 13. 4 Placing File Records on Disk 13. 5 Operations on Files 427 13. 6 Filesof Unordered Records (Heap Files) 13. 7 ... to the database, all other users can Databases and Database Users Databases and database systems have become an essential component of everyday life in modern...

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... Sections 13. 3.1 and 13. 3.2, we discuss how RAID achieves the two important objectives of improved reliability and higher performance. Section 13. 3 .3 discusses RAID organizations. 13. 10.1 Improving ... soon be reserved for databases containing tens of terabytes. 13. 1.2 Storage of Databases Databases typically store large amounts of data that must persist over long periods o...

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... for the problem of physical database design. 16.2 An Overview of Database Tuning in Relational Systems I 541 dependencies {{STUDENT, COURSE} ~ INSTRUCTOR, INSTRUCTOR ~ COURSE}. A lossless decomposi- tionof TEACH into T1 ... database systems and demonstrates how concurrent execution of transactions can take place in multiuser systems. Section 17.1.2 defines the concept of t...

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... available systems included GEMSTONE/OPAL of GemStone Systems, ONTOS of Ontos, Objectivity of Objectivity Inc., Versant of Versant Object Technology, ObjectStore of Object Design, ARDENT of ARDENT Software," and POET of POET Software. These represent ... since the majority of 00 databases support types, we will assume that extents are collections of objects of the...

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... centralized DBMS? 25 .3. What are the main software modules of a DDBMS? Discuss the main functions of each of these modules in the context of the client-server architecture. 25.4. What is a fragment of a relation? What are the main types ... represent attributes of records of a file or, in terms of relations, columns of rows of a relation, and can be categorical or quanti...

Ngày tải lên: 08/08/2014, 18:22