Ebook Database system concepts (6th edition) Part 2

... called database state (or occurrence) Database Schema Vs Database State • Database State: Refers to the content of a database at a moment in time • Initial Database State: Refers to the database ... A set of concepts to describe the structure of a database, and certain constraints that the database should obey  Data Model Operations: Operations for specifying database...

Ngày tải lên: 12/05/2014, 11:55

... PREFACE This volume is an instructor’s manual for the Sixth Edition of Operating- System Concepts by Abraham Silberschatz, Peter Baer Galvin, and Greg Gagne It consists of answers ... machines also provide a good platform for operating system research since many different operating systems may run on one physical system 12 Chapter Operating- System Structures 3.14 Why...

Ngày tải lên: 28/06/2014, 00:20

... parameters, in- Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II Relational Databases 1 83 © The McGraw−Hill Companies, 2001 SQL 4. 13 Dynamic SQL 177 int ODBCexample() { RETCODE ... and Darwen [1997] and Date [1993a] include a critique of SQL-92 Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II Relational Databases SQL 1 93 © The...

Ngày tải lên: 08/08/2014, 18:22

... however, mirrored-disk systems offer much higher reliability than single-disk systems Mirrored-disk systems with mean time to data loss of about 50 0,000 to 1,000,000 hours, or 55 to 110 years, are ... Figure 10 .5 Unique tag names through the use of namespaces Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition III Object−Based Databases and XML 369 © The...

Ngày tải lên: 08/08/2014, 18:22

... 31 c 33 e 16 e 16 e 16 c b 14 b 14 b 14 g 24 c 33 a 19 d 31 g 24 a 24 d 31 g 24 r 16 d 21 d 21 m m r 16 p d d initial relation d 31 e 16 g 24 m p 2 r 16 runs merge pass –1 d 21 r 16 runs Figure ... Round Hill bucket B-tree equivalent of B+ -tree in Figure 12.12 465 466 Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition IV Data Storage and Querying © The McGraw...

Ngày tải lên: 08/08/2014, 18:22

... Chapter 17 571 572 Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition V Transaction Management © The McGraw−Hill Companies, 2001 15 Transactions 15.4 Concurrent Executions 573 15.4 ... et al [1996], Labio et al [19 97] , Gupta [19 97] , Chaudhuri and Narasayya [19 97] , and Roy et al [2000] Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition...

Ngày tải lên: 08/08/2014, 18:22

... 687 688 Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition VI Database System Architecture © The McGraw−Hill Companies, 2001 18 Database System Architecture 18. 3 Parallel Systems ... Figure 18. 1 A centralized computer system 681 682 Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition VI Database System Architecture 18 Database Sys...

Ngày tải lên: 08/08/2014, 18:22

... models used in traditional database systems • Database systems deal with several operations that are not addressed in information-retrieval systems For instance, database systems deal with updates ... document containing 10 occurrences of a term may not be 10 times as relevant as a document containing one occurrence Silberschatz−Korth−Sudarshan: Database System Concepts,...

Ngày tải lên: 08/08/2014, 18:22