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Descriptions about the the implementation of databases tend to be scattered through user manuals, company reports, academic research reports, and internal documents Manufacturers manuals describe only what the system will do and not what it will not do; a number of systems are referenced in Appendix B Manuals do, of course, provide much more detail than can be found in scholarly publications The reference material on IMS alone exceeds by far the size of this book The terminology used is often speci c to the system and may even di er from the terminology used to describe other systems of the same manufacturer Appendix A is intended to be helpful here Descriptions of new systems are found in the popular computing magazines A number of textbooks as Cardenas79 , Kroenke78 , and Tsichritzis77 stress description and comparison of database-management systems Specialized database systems are typically described in application-oriented publications; see the references in Chap 1 Early descriptions in the computer literature included Bachman64 , Dodd66 , Bleier68 , and Hsiao71 Specialized systems include PARS (Siwiec77 ) and TOD (Weyl75 ) Improvement of binding choices is considered by Stemple76 Nunamaker73 considers the database system as a unit in a larger user support system Some early work in set-oriented databases (Childs68 ) led to RDMS (Steuert in Rustin74 ), and related systems as MACAIMS (Strnad71 ), SAM (Symonds68 ), and DAMAS (Rothnie in Rustin74 ) Papers by EF Codd (in Codd71 , Rustin72 , and Klimbie75 ) and his colleagues (Boyce75 ) have provided impetus for relational implementations After initial experimentation using APL (Palermo75 ) came several developmental systems, as IS/1 or PRTV (Todd in Kerr75 ), MORIS (Bracchi in Klimbie75 ), INGRES (Held75 , Stonebraker76 ), and SYSTEM-R (Chamberlin76 , King80 )Some systems try to integrate the programming language with database manipulation (Schmidt77 , Shopiro79 , and vandeRiet81 ) Some of these systems are now moving into commerce (Chamberlin81G ) King80 assesses their status Brodie82 surveys the large number of relational systems are now on the market; Appendix B lists many Not all systems going by the name relational provide the same range of functions and their performance di ers greatly Some systems appear even to be limited to handling one relation at a time The process of translation of relational calculus languages is detailed by Codd in Rustin72 and has received much attention Gotlieb in King75 analyzed the cost of joins Merrett81 tries to reduce their costs Problems of operational e ciency are being attacked by Rothnie in Rustin74 , Wong76 , H rder78 , Selinger in Bernstein79 , Yao79 , Aho79S , and a 80 Katz in Chen Sequences of queries are optimized by Finkelstein82 Hall76 and Smith75 consider relational algebras Major joint e orts by users and manufacturers produced the rst large commercial database systems, IDS (Bachman66 ) and IMS (Lutz71 , McGee77 ) Techniques for optimal design, considering both retrieval and update, are due to Yao77,79 and Whang81 Design of CODASYL databases was considered by Gambino77 , and Whang82 provides separability rules Methods to aid database design decisions has been published (Mehl in Rustin74 , Smith in King75 ) Lusk in Chen80 , Hubbard81 , and Gerritsen in Yao82 They all tend to apply to speci c system styles At the same time a number of relatively simple but clean implementations of databases have become available commercially: SYSTEM 2000, ADABAS, TOTAL Commercially available systems have been compared in CODASYL71A (see Olle71 ), Cohen75 , and Palmer75 Many comparisons describe features and su er from lack of an underlying model Comparisons of systems are often part of a company s software selection process and, if they can be obtained will provide good study material Problems faced in hierarchical query design.





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Vgs/Id 2Vgs)/2 for a Vd of Vdd/2

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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

4 Calculate Rd (Vdd Vds Vgs)/Id (If Rd computes to lower than 1 kilohm, an RFC must be used between the top of Rd and the Vdd in order to sustain a minimum RF impedance into the power supply) 5 Place a high-impedance RFC (with an appropriate SRF) or a high-value resistor (1 megohm) from the FET s gate to ground 6 CC 1 ohm 7 Add bypass capacitor CS to increase the gain of the amplifier Note: Always confirm that the FET will safely dissipate the power required, which is P IdVd Since Vgs for a specific Id is not always available, use the following equation to find Vgs when Idss and Vp are known (look in the JFET data sheet for Idss and Vp): Vgs Vp 1 Id Idss (Vp Vgs(off) and Vs Vgs)

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