Database Management systems phần 4 pps

... illustrated in Figure 11.5. 6,2 8,7 9 ,4 3 ,4 2,3 4, 4 6,7 8,9 1,2 3,5 6 5,6 2 3,1 3 ,4 9 ,4 6,2 8,7 Input file 1st output run 2nd output run Buffer pool with B =4 pages Figure 11 .4 External Merge Sort with B ... 3 .4 53901 Jones jones@toy 18 3 .4 53902 Jones jones@physics 18 3 .4 53903 Jones jones@english 18 3 .4 539 04 Jones jones@genetics 18 3 .4 53905 Jones jones@astro 18 3...

Ngày tải lên: 08/08/2014, 18:22

... operations). Parallel and Distributed Databases 641 performance database systems, parallelism will be the key. Scheduling in parallel database systems is discussed in [45 4]. [43 1] contains a good collection ... distributed systems. [82] contains several articles on these topics. Multidatabase systems are discussed in [7, 96, 193, 1 94, 205, 41 2, 42 0, 45 1, 45 2, 522, 558, 6...

Ngày tải lên: 08/08/2014, 18:22

... configurations by user or role Features of Document Management systems 5. Database management systems - 4. Textual, relational and xml databases – page 4 Flat file databases A field must contain more than ... native XML database (http://sourceforge.net/ ) 5. Database management systems - 4. Textual, relational and xml databases – page 13 XML and databases Relational da...

Ngày tải lên: 31/03/2014, 20:20

... Protection 2811 Agriculture Drive / PO Box 8911 Madison, WI 53708 – 8911 Phone: 608-2 24- 5055 Fax: 608-2 24- 5110 Web: www.datcp.state.wi.us Note: For web site, click on “Farming & Agriculture” ... Energy Program Scott A. Sanford Senior Outreach Specialist Agricultural Engineering Building 46 0 Henry Mall Madison, WI 53706 Phone: 608-262-5062 Fax: 608-262-1228 E-mail: sasa...

Ngày tải lên: 08/08/2014, 15:21

... QUERIES 89 4 RELATIONAL ALGEBRA AND CALCULUS 91 4. 1 Preliminaries 91 4. 2 Relational Algebra 92 4. 2.1 Selection and Projection 93 4. 2.2 Set Operations 94 4.2.3 Renaming 96 4. 2 .4 Joins 97 4. 2.5 Division ... 630 21.13 .4 Three-Phase Commit 632 21. 14 Points to Review 632 22 INTERNET DATABASES 642 22.1 The World Wide Web 643 22.1.1 Introduction to HTML 643 22.1.2 Databases a...

Ngày tải lên: 08/08/2014, 18:22

... Figures 4. 15, 4. 16, and 4. 17, respectively. sid sname rating age 22 Dustin 7 45 .0 29 Brutus 1 33.0 31 Lubber 8 55.5 32 Andy 8 25.5 58 Rusty 10 35.0 64 Horatio 7 35.0 71 Zorba 10 16.0 74 Horatio ... 63.5 Figure 4. 15 An Instance S3 of Sailors sid bid day 22 101 10/10/98 22 102 10/10/98 22 103 10/8/98 22 1 04 10/7/98 31 102 11/10/98 31 103 11/6/98 31 1 04 11/12/98 64 101 9/5/98...

Ngày tải lên: 08/08/2014, 18:22

... disk: The IBM Deskstar 14GPX. The IBM Deskstar 14GPX is a 3.5 inch, 14. 4 GB hard disk with an average seek time of 9.1 milliseconds (msec) and an average rotational delay of 4. 17 msec. However, the time ... shown in Figure 6.1. On this instance the following sid sname rating age 22 dustin 7 45 .0 58 rusty 10 35.0 44 horatio 7 35.0 Figure 6.1 An Instance of Sailors query prints the value...

Ngày tải lên: 08/08/2014, 18:22

... bucket. Figure 14. 4 shows two different kinds of histograms, called equiwidth and equidepth, respectively. 10 11 12 13 140 2 31 5678 941 0 11 12 13 140 2 31 5678 94 10 11 12 13 140 2 31 5678 94 10 11 12 13 140 2 31 ... Parallel algorithms for implementing relational operations are discussed in [86, 141 , 185, 189, 196, 251, 46 4]. 3 84 Chapter 14 conditions c 1 cn at the same time....

Ngày tải lên: 08/08/2014, 18:22

... {(a,2,3 ,4, 5), (2,a,3,5,5)} (c) {(a,2,3 ,4, 5), (2,a,3,5,5), (a,2,3 ,4, 6)} (d) {(a,2,3 ,4, 5), (2,a,3 ,4, 5), (a,2,3,6,5)} (e) {(a,2,3 ,4, 5), (2,a,3,7,5), (a,2,3 ,4, 6)} (f) {(a,2,3 ,4, 5), (2,a,3 ,4, 5), (a,2,3,6,5), ... dependency information to construct sample relation instances is described in [44 2, 44 3]. 49 4 Chapter 16 3. Suppose that your database system has very inefficient im...

Ngày tải lên: 08/08/2014, 18:22

... with the writing of a checkpoint record. Concurrency Control 553 3* 4* 6* 9* 10* 11* 12* 13* 20*22* 23* 31* 35* 36* 38 *41 * 44 * 20 44 38 12 623 35 10 DE C B A F GH I Figure 19.5 B+ Tree Locking Example E ... for data entry 40 *. 2. Search for all data entries k∗ with k ≤ 40 . 3. Insert data entry 62*. 4. Insert data entry 40 *. 5. Insert data entries 62* and 75*. Exercise 19.11 Con...

Ngày tải lên: 08/08/2014, 18:22