Database Management systems phần 9 ppt

... 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 ... con- cepts, rather than on presenting SQL: 199 9; some of the features that we discuss are not included in SQL: 199 9. We have tried to be consistent with SQL: 199 9 f...

Ngày tải lên: 08/08/2014, 18:22

... SQL The examples shown in Figure 5. 19, written using Oracle 7 Server syntax for defining triggers, illustrate the basic concepts behind triggers. (The SQL: 199 9 syntax for these triggers is similar; ... integer , budget: real, managerid: integer) Write SQL -92 integrity constraints (domain, key, foreign key, or CHECK constraints; or asser- tions) or SQL: 199 9 triggers to ensure each of the...

Ngày tải lên: 08/08/2014, 18:22

... ENERGY MANAGEMENT HANDBOOK Energy Management Improvement Act of 198 8; Execu- tive Order 127 59 in 199 1; the National Energy Policy Act of 199 2 (EPAct 199 2); Executive Order 1 290 2 in 199 4; Ex- ecutive ... Strachan, P.A. and Pemot, C 199 3. An Approach to the Calibration of Building Energy Simulation Models. ASHRAE Transactions. 99 (2): 91 7 -92 7. 162. Diamond, S.C. and Hunn,...

Ngày tải lên: 08/08/2014, 15:21

... 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 99 4.2.6 More Examples of Relational Algebra Queries 100 xxviii Database Management ... Gray won the 199 9 Turing award for his contributions to the field of transaction management in a DBMS. In the late 198 0s and the 199 0s, advances have been made in many ar...

Ngày tải lên: 08/08/2014, 18:22

... Sailors sid bid day 22 101 10/10 /98 22 102 10/10 /98 22 103 10/8 /98 22 104 10/7 /98 31 102 11/10 /98 31 103 11/6 /98 31 104 11/12 /98 64 101 9/ 5 /98 64 102 9/ 8 /98 74 103 9/ 8 /98 Figure 4.16 An Instance R2 ... 101 10/10 /98 Dustin 102 10/10 /98 Dustin 103 10/8 /98 Dustin 104 10/7 /98 Lubber 102 11/10 /98 Lubber 103 11/6 /98 Lubber 104 11/12 /98 Horatio 101 9/ 5 /98...

Ngày tải lên: 08/08/2014, 18:22

... Chapter 9 10 20 30 80 35 42 50 65 90 98 ABC 30* 31* 36* 38* 42* 43* 51* 52* 56* 60* 68* 69* 70* 79* 81* 82* 94 * 95 * 96 * 97 * 98 * 99 * 105* L1 L2 L3 L4 L5 L6 L7 L8 I1 I2 I3 100* Figure 9. 29 Tree ... jones@sanitation 18 3.8 53688 Smith smith@ee 19 3.2 53650 Smith smith@math 19 3.8 54001 Smith smith@ee 19 3.5 54005 Smith smith@cs 19 3.8 540 09 Smith smith@astro 19 2.2 Fi...

Ngày tải lên: 08/08/2014, 18:22

... secondary indexes. Assume that R.a is a candidate key for R, with values lying in the range 0 to 4 ,99 9 ,99 9, and that R is stored in R.a order. For each of the following relational algebra queries, state ... and equidepth, respectively. 10 11 12 13 140 2 31 567 894 10 11 12 13 140 2 31 567 894 10 11 12 13 140 2 31 567 894 10 11 12 13 140 2 31 567 894 Equidepth 2.67 1.33 5.0 1.0 5.0 2.67 1...

Ngày tải lên: 08/08/2014, 18:22

... case than with an index on age, sal. 16.7 OVERVIEW OF DATABASE TUNING After the initial phase of database design, actual use of the database provides a valuable source of detailed information ... general, physical database design. How do you see Designview being used, if at all, in the context of physical database design? BIBLIOGRAPHIC NOTES [572] is an early discussion of physica...

Ngày tải lên: 08/08/2014, 18:22

... and the 568 Chapter 19 S5 S11 S12 All Schedules View Serializable Conflict Serializable Recoverable Avoid Cascading Abort Strict Serial S10 S8 S9 S6 S3S2 S7 S4 S1 Figure 19. 10 Venn Diagram for ... locking. 3. Explain what index locking is and how it resolves the preceding conflict. Exercise 19. 9 SQL -92 supports four isolation-levels and two access-modes, for a total of eight combinations o...

Ngày tải lên: 08/08/2014, 18:22

... on these topics. Multidatabase systems are discussed in [7, 96 , 193 , 194 , 205, 412, 420, 451, 452, 522, 558, 672, 697 ]; see [95 , 421, 595 ] for surveys. Internet Databases 6 49 An example of a real ... these operations). Parallel and Distributed Databases 641 performance database systems, parallelism will be the key. Scheduling in parallel database systems is discussed in [45...

Ngày tải lên: 08/08/2014, 18:22