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Chap 9
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Exercises
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are described by Hardgrave80 Lefkovitz74 describes implementation issues in a general sense The work of the CODASYL group has become the basis for the implementation or augmentation of a number of commercial database systems: DBMS-1100 (Emerson in Jardine74 ), 80 IDMS and Boeing IPAD (Swanson ) Issues of CODASYL implementation (Olle78 , Douque76 , and Parsons74 ) and appropriate usage (Stacey74 , Taylor in Rustin74 and in Douque76 ) have been presented Buneman82 implemented a functional query language within a CODASYL structure Some worked-out example programs have become available to aid in the evaluation of the DBTG design: Frank73 (Codd in Rustin74 uses the same example), and Robinson in Douque76 In Sibley76 a sample database about US presidents is used for three approaches The work of CODASYL is continuing and changes in syntax and semantics continue to be made These changes are published regularily as change pages to the Journal of Development (CODASYL73, ) The relational approach is compared with the implementation of IMS and the speci cation of CODASYL by Bachman75 , Martin77 , Date81 , Olle in Benci75 , and Nijssen in Neuhold76 The signi cance of the relational approach is stated by Codd82 Analyses of the e ects of implementation choices are given by Bachman in Jardine74 , Stonebraker80 , Kay in Douque76 , and Engles in Neuhold76 The issues of optimal distribution of data and queries in a network have been analyzed by Eswaran74 , Chu79 , Baldissera79 , Hevner79 , and Ceri81 When replication of fragments of the database is permitted the optimal allocation problem becomes very hard, although designers have been able to deal in an ad hoc manner with practical cases Morgan77 considers the constraints due to the dependencies between programs and data Bernstein81 analyzes a method to minimize join costs between sites The topics have been surveyed by Epstein80 and Hevner in Wiederhold82 Recent developments in implementation include Tandem s ENFORM system At CCA investigations were based on the design of SDD-1 (Rothnie80 ) Proposals for distribution have made by Stonebraker79 and several systems in development are presented in Wiederhold82
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EXERCISES 1 What are the result relations from the examples in Sec 9-1-2 given the data in the relations from Chap 7 2 How would the query for employees supervised by younger empoyees shown in Example 9-3 be formulated if there were no necessity to specify the relation names 3 Write the statements required in the relational calculus to obtain the names of departments which have employees with the skill to assemble a given Assembly from the Automobile section b relation using the examples summarized in Fig 7-29 4 Work out the division in Example 9-4, using the de nition of division given below the example 5 Formulate for the hierarchy of Fig 9-8 the query, Who has children at UC Berkeley and UCLA
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6 Estimate the retrieval time of the query in Exercise 5 in terms of fetch and get-next for a hierarchical and a relational database structure 7 Determine the answer for the query: Which department has employees with children at UC Berkeley who supervise more than two people which is formulated as follows: GET department | schoolname= UC Berkeley COUNT(supervision) > 2 Then x the query to represent the stated intent 8 For which attributes would you expect to nd the speci cation KEY or NONKEY in SYSTEM 2000 Who in an organization using such a database should know about the existence of the speci cation, and who should not 9 Sketch the layout of the relations auto section, suppliers, parts, supply, possible supplier and parts skill required in a hierarchical and in a network-type database 10 Program at a high level the process of locating the suppliers of any part in an auto section in a relational algebra database, a hierarchy, and a network 11 Estimate the retrieval times of each of the above processes State all assumptions, and use the same assumptions in all three cases 12 Compare the above process given the SYSTEM 2000 le structure and the OASIS le structure 13 What attributes are stored redundantly in the TOTAL network database design given in Fig 9-10 14 Sketch the TOTAL records for supplier and supplier assembly of Fig 9-10 15 What is the di erence between KEY in SYSTEM 2000 and LOCATION MODE EQUALS CALC in CODASYL 16 What CODASYL access choice would you use to locate an employee given his name Why 17 To avoid problems with reference pointers, an implementor decides to use symbolic references What will happen to each of the seven performance parameters used in Chap 3 for such a system 18 Could a programmer e ectively navigate through a DBTG structure for the relations shown in Fig 9-19 What about a manager 19 What is the di erence in the implementation of multiple member types in a TOTAL nest relation and multiple member types of a DBTG link set 20 Compare the storage of IMS tree instances with the storage of MUMPS tree instances in terms of storage density, and fetch and get-next speed 21 Find an example of a database system other than the ones mentioned in the text which incorporates features belonging more properly to a le system Explain why the database system was designed in this manner Suggest an alternate approach
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520 This le is c 1977 and 1983 by McGraw-Hill and c 1986, 2001 by Gio Wiederhold DATABASE DESIGN, Gio Wiederhold CHAPTER 10, le chap10tex
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