Database Management systems phần 10 pdf

... Obermarck. Transaction management in the R* dis- tributed database management system. ACM Transactions on Database Systems, 11(4):378–396, 1986. 864 Database Management Systems [387] H. Korth, ... Transactions on Database Systems, 15(2):162–207, 1990. 872 Database Management Systems [567] R. E. Sanders. ODBC 3.5 Developer’s Guide. McGraw-Hill Series on Data Warehousin...

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

... A Dynamic Index Structure 10. 3.1 Format of a Node 10. 4 Search 10. 5 Insert 10. 6 Delete 10. 7 Duplicates 10. 8 B+ Trees in Practice 10. 8.1 Key Compression 10. 8.2 Bulk-Loading a B+ Tl'ee 10. 8.3 The Order Concept 10. 8.4 The Effect ... several commercial systems based on this model. [721] contains a good annotated collection of systems- oriented papers on database mana...

Ngày tải lên: 29/03/2014, 12:20

... day Dustin 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 Horatio 102 9/8/98 Horatio 103 9/8/98 Figure ... 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 of Reserves bid bname color...

Ngày tải lên: 08/08/2014, 18:22

... we could say < 10 to retrieve sailors with a rating less than 10 or say 10 to retrieve sailors whose rating is not equal to 10. The expression 10 in an attribute column is thesameas= 10. As we ... rating age P. 10 Placing a constant, say 10, in a column is the same as placing the condition =10. This query is very similar in form to the equivalent DRC query {I,N ,10, A|I,N ,1...

Ngày tải lên: 08/08/2014, 18:22

... B=129 B=257 100 7 4 3 2 1 1 1,000 10 5 4 3 2 2 10, 000 13 7 5 4 2 2 100 ,000 17 9 6 5 3 3 1,000,000 20 10 7 5 3 3 10, 000,000 23 12 8 6 4 3 100 ,000,000 26 14 9 7 4 4 1,000,000,000 30 15 10 8 5 4 Figure ... is shown in Figure 10. 9. 10 h h 00 01 10 11 000 001 010 011 00 100 Next=1 PRIMARY PAGES OVERFLOW PAGES Level=0 32* 9* 5* 25* 14* 18* 10* 30* 31* 35* 7* 11* 44* 36* 4...

Ngày tải lên: 08/08/2014, 18:22

... histograms, called equiwidth and equidepth, respectively. 10 11 12 13 140 2 31 56789 410 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 ... result should be uniformly ignored. Relation R contains 10, 000 tuples and has 10 tuples per page. Relation S contains...

Ngày tải lên: 08/08/2014, 18:22

... CHAR (10) , rating INTEGER, age REAL, assigned INTEGER NOT NULL, PRIMARY KEY (sid), FOREIGN KEY (assigned) REFERENCES Boats (bid)) CREATE TABLE Boats ( bid INTEGER, bname CHAR (10) , color CHAR (10) , captain ... Consider a database that is organized in terms of the following hierarachy of objects: The database itself is an object (D), and it contains two files (F 1andF2), each of which co...

Ngày tải lên: 08/08/2014, 18:22

... 6. Internet Databases 665 Rid Document Signature 1 agent James Bond 1100 2 agent mobile computer 1101 3 James Madison movie 101 1 4 James Bond movie 1 110 Word Inverted list Hash agent 1, 2 100 0 Bond ... 2 100 0 Bond 1, 4 0100 computer 2 0100 James 1, 3, 4 100 0 Madison 3 0001 mobile 2 0001 movie 3, 4 0 010 Figure 22.9 A Text Database with Four Records and Indexes...

Ngày tải lên: 08/08/2014, 18:22