Database systems concepts 4th edition phần 5 ppsx

... however, mirrored-disk systems offer much higher reliability than do 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 available ... to Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition III. Object−Based Databases and XML 10. XML 377 © The McGraw−Hill Companies, 2001 10.4 Que...

... (person-name , manager-name) Figure 5. 15 Employee database. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II. Relational Databases 5. Other Relational Languages 202 © ... write Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II. Relational Databases 5. Other Relational Languages 2 25 © The McGraw−Hill Companies, 2001 220 C...

... in Figure 12. 25. a. Construct a bitmap index on the attributes branch-name and balance, divid- ing balance values into 4 ranges: below 250 , 250 to below 50 0, 50 0 to below 750 , and 750 and above. b. ... larger bucket 0 bucket 1 A-2 15 A-3 05 bucket 2 A-101 A-110 bucket 3 A-217 A-102 A-201 bucket 4 A-218 bucket 5 bucket 6 A-222 A-217 Brighton 750 A-101 Downtown 50 0 A-110 Downtow...

... efficiently. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition IV. Data Storage and Querying 14. Query Optimization 55 5 © The McGraw−Hill Companies, 2001 14 .5 Materialized Views∗∗ 55 5 When a set of ... 3. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition V. Transaction Management 15. Transactions 57 7 © The McGraw−Hill Companies...

... checkpoint. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition V. Transaction Management 17. Recovery System 653 © The McGraw−Hill Companies, 2001 17 .5 Shadow Paging 655 1 2 3 4 5 6 7 8 9 10 shadow ... 18 .5 illustrates linear and sublinear speedup. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition VI. Database System Architect...

... 833 degree income income income income bachelors masters doctorate none bad average good bad average good excellent < ;50 K >100K <25K >=25K > =50 K < ;50 K <25K >75K 25 to 75K 50 to 100K Figure 22.6 Classification tree. to find which child ... Downtown 50 0 1999/1/1 9:00 1999/1/24 11:30 A-101 Downtown 100 1999/1/24 11:30 * A-2 15 Mianus 700 2000/6/2 15: 30 2000/8/8 1...