FUNDAMENTALS OF DATABASE SYSTEMS Fourth Edition phần 1 potx

... Structures, and Hashing 411 13 .1 Introduction 412 13 .2 Secondary Storage Devices 13 .3 Bufferingof Blocks 4 21 13.4 Placing File Records on Disk 13 .5 Operations on Files 427 13 .6 Filesof Unordered Records ... illustrate our discussion. Section 1. 3 describes some of the main characteristics of database systems, and Sections 1. 4 and 1. 5 categorize the types of person...

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... Files 11 5 5.7 Files of Unordered Records (Heap Files) 11 7 5.8 Files of Ordered Records (Sorted Files) 11 8 5.9 Hashing Techniques 12 0 5 .10 Other Primary File Organizations 12 6 5 .11 Summary 12 6 ... Organizations 10 0 5 .1 Introduction 10 1 5.2 Secondary Storage Devices 10 3 5.3 Parallelizing Disk Access Using RAID Technology 10 7 5.4 Buffering of Blocks 11 1...

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... out the role of data dictionaries. Rozen and Shasha (19 91) and Carlis and March (19 84) present different models for the problem of physical database design. 16 .2 An Overview of Database Tuning ... * ro)/bfrEO) = 13 + (13 * 2000) + « (1/ 125) * 10 ,000 * 12 5/4) = 28, 513 3. Using Method J2 with EMPLOYEE as outer loop: C l l c = bE + (rE * (XDNUMBER + 1) ) + «j s oP6 *rE *...

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... 9876543 21 1995- 01- 01 Headquarters 1 888665555 19 81- 06 -19 IWORKS_ON ESSN PNO HOURS 12 3456789 1 32.5 12 3456789 2 7.5 666884444 3 40.0 453453453 1 20.0 453453453 2 20.0 333445555 2 10 .0 333445555 3 10 .0 333445555 10 10 .0 333445555 ... Alice F 19 86-04-05 DAUGHTER 333445555 Theodore M 19 83 -10 -25 SON 333445555 Joy F 19 58-05-03 SPOUSE 9876543 21 Abner M 19 42-02-...

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... 333445555 2 10 .0 Computerization 10 333445555 10 10 .0 Computerization 10 999887777 10 10 .0 Computerization 10 987987987 10 35.0 Reorganization 20 333445555 20 10 .0 Reorganization 20 9876543 21 20 15 .0 Reorganization 20 888665555 ... 2 12 3456789 2 7.5 ProductY 2 453453453 2 20.0 ProductY 2 333445555 2 10 .0 ProductZ 3 666884444 3 40.0 ProductZ 3 333445555 3 10 .0 Com...

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... guideline. Smith,John B. English,Joyce A. Smith,John B. English,Joyce A. Wong, Franklin T. Narayan,Ramesh K. Wong,Franklin T. Smith,John B. English,Joyce A. Smith,John B. English,Joyce A. Wong, Franklin T. Smith,John B. English,Joyce A. Wong, Franklin T. Narayan,Ramesh K. Wong,Franklin T. Wong,Franklin T. Narayan,Ramesh K. Wong, Franklin T. ENAME Bellaire Bellaire Sugarland Sugarland Sugarlan...

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... Errors Seek Errors (courtesy Seagar« Technology) 1, 200,000 Hours 10 per 10 12 bits 1 per 10 15 bits 10 per 10 8 bits 1, 200,000 Hours 10 per 10 12 bits 1 per 10 15 bits 10 per 10 8 bits Sometimes several contiguous ... used to refer to unordered files. 12 .5 Automated Database Design Tools I 4 01 FIGURE 12 .16 The class OM_EMPLOYEE corresponding to the table Em...

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... available systems included GEMSTONE/OPAL of GemStone Systems, ONTOS of Ontos, Objectivity of Objectivity Inc., Versant of Versant Object Technology, ObjectStore of Object Design, ARDENT of ARDENT Software," and POET of POET Software. These represent ... T 1 read_item(A) read_item(O) write_item(O) T 2 read_item(B) write_item(B) read_item(O) write_item(O) T~ __ read_ite...

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... for the design and protection of statistical databases. These include McLeish (19 89), Chin and Ozsoyoglu (19 81) , Leiss (19 82), Wong (19 84), and Denning (19 80). Ghosh (19 84) discusses the use of statistical databases ... Applications EMP_VT SUPERVISOR_SSN Smith 12 3456789 25000 5 333445555 2002-06 -15 2003-05- 31 Smith 12 3456789 30000 5 333445555 2003-06- 01 now Wong 333445...

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... Siegel and Madnick (19 91) , Krishnamurthy et al. (19 91) , and Wang and Madnick (19 89). Castano et al. (19 98) present an excellent survey of techniques for analysis of schemas. Pitoura et al. (19 95) discuss ... object orientation in multidatabase systems. Transaction processing in multidatabases is discussed in Mehrotra et al. (19 92), Georgakopoulos et al. (19 91) , Elmagarmid e...

Ngày tải lên: 08/08/2014, 18:22