operating systems concepts 7th edition slides

... of operating systems is how they vary in accomplishing these tasks. Mainframe operating systems are designed primarily to optimize utilization of hardware. Personal computer ( PC) operating systems ... features of an operating system are and what an operating system does for the user. We include coverage of both traditional PC and server operating systems, as well as operating systems for mobile devices. ... archi- tecture, we are ready to talk about operating systems. An operating system provides the environment within which programs are executed. Internally, operating systems vary greatly in their makeup,...

Ngày tải lên: 16/02/2014, 22:58

... execute. 1.4 What are the main differences between operating systems for mainframe computers and personal computers? Answer: The design goals of operating systems for those machines are quite different. PCs ... 4 PROCESSES In this chapter we introduce the concepts of a process and concurrent execution; These concepts are at the very heart of modern operating systems. A process is is a program in execution ... the instruction execution cycle. Since the operating system is the interface be- tween the hardware and user programs, a good understanding of operating systems requires an understanding of both...

Ngày tải lên: 28/06/2014, 00:20

... implemented on data- base systems that do not support recursion. However, writing such queries by iter- Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II. Relational ... This call takes several parameters, in- Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition II. Relational Databases 5. Other Relational Languages 219 â The McGrawHill Companies, ... SilberschatzKorthSudarshan: Database System Concepts, Fourth Edition II. Relational Databases 4. SQL 182 â The McGraw−Hill Companies, 2001 176 Chapter...

Ngày tải lên: 08/08/2014, 18:22

... all the blocks of the file sequentially on adjacent cylinders. Older operating systems, such as the IBM mainframe operating systems, provided programmers fine control on placement of files, allowing ... reorganization if data are inserted to or deleted from the file. Subsequent operating systems, such as Unix and personal-computer oper- ating systems, hide the disk organization from users, and manage the ... spite of all these considerations, however, mirrored-disk systems offer much higher reliability than do single-disk systems. Mirrored-disk systems with mean time to data loss of about 500,000 to...

Ngày tải lên: 08/08/2014, 18:22

... Database System Concepts, Fourth Edition IV. Data Storage and Querying 13. Query Processing 498 â The McGrawHill Companies, 2001 13.3 Selection Operation 497 In relational systems, a file scan ... 12.26 Hash function for branch-name. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition IV. Data Storage and Querying 13. Query Processing 497 â The McGrawHill Companies, ... records that fulfill a selection condition. Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition IV. Data Storage and Querying 12. Indexing and Hashing 481 â The McGrawHill Companies,...

Ngày tải lên: 08/08/2014, 18:22

... SilberschatzKorthSudarshan: Database System Concepts, Fourth Edition V. Transaction Management 15. Transactions 570 â The McGraw−Hill Companies, 2001 15.3 ... is committed as follows. First, the operating system is asked to make sure that all pages of the new copy of the database have been written out to disk. (Unix systems use the flush command for this ... technique for atomicity and durability. SilberschatzKorthSudarshan: Database System Concepts, Fourth Edition V. Transaction Management 15. Transactions 569 â The McGraw−Hill Companies, 2001 570...

Ngày tải lên: 08/08/2014, 18:22

... and reduce recovery time. 17.10 Remote Backup Systems Traditional transaction-processing systems are centralized or client–server systems. Such systems are vulnerable to environmental disasters ... rollback and recovery strategies in database systems, is another early work in this area. SilberschatzKorthSudarshan: Database System Concepts, Fourth Edition V. Transaction Management 17. Recovery ... Silberschatz−Korth−Sudarshan: Database System Concepts, Fourth Edition VI. Database System Architecture 18. Database System Architecture 688 â The McGrawHill Companies, 2001 18.3 Parallel Systems 691 The bibliographical...

Ngày tải lên: 08/08/2014, 18:22

Ngày tải lên: 08/08/2014, 18:22

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21

Ngày tải lên: 12/08/2014, 22:21