Database Management systems phần 3 pptx

... 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 38 .3: Sailors sid sname rating age A P.AVG. A Thus, the value 35 .0 is counted twice in ... change is propagated to the copy of the page on disk. Buffer management is illustrated in Figure 7 .3. Storing Data: Disks and Files 2 03 7.2 .3 Levels of Redundancy Throughout the disc...

Ngày tải lên: 08/08/2014, 18:22

... system for management 01_Report_20 03- 01-22_ 13: 30 Versions Root folder Sub folder B Sub folder A Sub folder C 01_Report_20 03- 01-22_ 13: 30 5. Database management systems - 3. Using a database ... choice. Content management Resources administration Semantic management 5. Database management systems - 3. Using a database for document management - page 3 R...

Ngày tải lên: 31/03/2014, 20:20

... Hashing * 33 0 12.4 .3 Sorting versus Hashing for Projections * 33 2 12.4.4 Use of Indexes for Projections * 33 3 12.5 The Join Operation 33 3 12.5.1 Nested Loops Join 33 4 12.5.2 Sort-Merge Join * 33 9 12.5 .3 ... OLAP Queries 685 23. 3 .3 Database Design for OLAP 689 23. 4 Implementation Techniques for OLAP 690 23. 4.1 Bitmap Indexes 691 23. 4.2 Join Indexes 692 23. 4 .3 Fi...

Ngày tải lên: 08/08/2014, 18:22

... Rusty 10 35 .0 64 Horatio 7 35 .0 71 Zorba 10 16.0 74 Horatio 9 35 .0 85 Art 3 25.5 95 Bob 3 63. 5 Figure 4.15 An Instance S3 of Sailors sid bid day 22 101 10/10/98 22 102 10/10/98 22 1 03 10/8/98 22 ... 4 .3, respectively. sid sname rating age 22 Dustin 7 45.0 31 Lubber 8 55.5 58 Rusty 10 35 .0 Figure 4.1 Instance S1 of Sailors sid sname rating age 28 yuppy 9 35 .0 31 Lubber 8 5...

Ngày tải lên: 08/08/2014, 18:22

... jones@physics 18 3. 4 539 03 Jones jones@english 18 3. 4 539 04 Jones jones@genetics 18 3. 4 539 05 Jones jones@astro 18 3. 4 539 06 Jones jones@chem 18 3. 4 539 02 Jones jones@sanitation 18 3. 8 536 88 Smith ... (Figure 10 .3) . Tree-Structured Indexing 277 sid name login age gpa 538 31 Madayan madayan@music 11 1.8 538 32 Guldu guldu@music 12 3. 8 536 66 Jones jones@cs 18 3...

Ngày tải lên: 08/08/2014, 18:22

... equidepth, respectively. 10 11 12 13 140 2 31 56789410 11 12 13 140 2 31 567894 10 11 12 13 140 2 31 567894 10 11 12 13 140 2 31 567894 Equidepth 2.67 1 .33 5.0 1.0 5.0 2.67 1 .33 5.0 1.0 5.0 2.67 1 .33 5.0 1.0 5.0 Equiwidth Bucket ... 1 Bucket 2 Bucket 3 Bucket 4 Bucket 5Bucket 1 Bucket 2 Bucket 3 Bucket 4 Bucket 5 Count=8 Count=4 Count=15 Count =3 Count=15 Bucket 1Bucket 1 C...

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), ... theory and its use in database design include [3, 38 , 436 , 4 43, 656]. Good survey articles on the topic include [6 63, 35 5]. FDs were introduced in [15...

Ngày tải lên: 08/08/2014, 18:22

... the writing of a checkpoint record. Concurrency Control 5 53 3* 4* 6* 9* 10* 11* 12* 13* 20*22* 23* 31 * 35 * 36 * 38 *41* 44* 20 44 38 12 6 23 35 10 DE C B A F GH I Figure 19.5 B+ Tree Locking Example E ... 1andT3) are reapplied in the order shown during the Redo phase. Finally, the actions of T 1andT3 are undone in reverse order during the Undo phase; that is, T 3 s write of P 3...

Ngày tải lên: 08/08/2014, 18:22

... {author 2 ,title 2 ,published 2 } book 3 is book, set, {author 3 ,title 3 ,published 3 } author 3 is author, set, {firstname 3 , lastname 3 } title 3 is title, string, "The English Teacher" published 3 is published, ... been developed: WebSQL [458], W3QS [38 4], WebLog [39 9], We- bOQL [32 ], STRUDEL [ 232 ], ARANEUS [39 ], and FLORID [31 9]. [ 237 ] is a g...

Ngày tải lên: 08/08/2014, 18:22

... equal Object -Database Systems 737 We will use acronyms for relational database management systems (RDBMS), object- oriented database management systems (OODBMS), and object-relational database management ... for object-oriented databases have been widely studied; papers include [4, 46, 62, 105, 33 1, 33 2, 36 6, 5 03, 635 ]. [36 5] proposes SQL extensions for querying...

Ngày tải lên: 08/08/2014, 18:22