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Reliability was the greatest concern of the users of early computers; problems were always run several times to verify correctness After the programming systems stabilized, users began to trust them with large quantities of data, and demands of reliability became more stringent Protection and integrity became a major concern with the development of multiuser systems, where one failure can impact dozens of users simultaneously, early contributions to understanding of the issues are by Ware67 and Wilkes72 The occasional failures continue to have a major impact on database users The relationship of load and failure rates is convincingly demonstrated by Iyer82 Physical security is stressed in guidelines for federal installations (NBS74 ) and is an important aspect of an AFIPS sponsored report and checklist (Browne79 ) A major study was sponsored by IBM(G320-1370 to 1376)74 and contains many suggestions and experiences, as well as a very detailed bibliography, but does not provide a consistent model Fernandez81 provides a text The eld of error-correcting codes is very well developed TMR was proposed already by Von Neuman; the low cost of processors makes this solution increasingly practical, as seen in the space shuttle (Sklaro 76 ) A basic textbook is Petersen72 ; for recent references a collection of papers on coding theory, Berlekamp74 , may be consulted Brown70 presents the method used for tape-error control and Tang69 covers decimal input checking schemes Reliability measures for data input are stressed by Stover73 Techniques to keep les secure are presented by Barron67 for ATLAS, Fraser69 , Weiss69 man for ADEPT, a military prototype, and Frey71 Yourdon72 and Martin73 present security techniques Karsner in Kerr75 presents experience at the Netherlands PTT Often reliability measures are discussed with the objective of improving the protection of privacy (Conway72 and others in Chap 12) The frequency with which back-up les or checkpoints should be taken has been considered by Vold73 Many current DBMSs provide rollback capability Appendix B lists several The extent of reliability coverage can be hard to ascertain from manuals, but practical experience has been quite favorable Verhofstad78 provides a thorough analysis Recovery-procedure concepts are presented by Lockeman68 , Oppenheimer68 , and Droulette71 for IBM OS VS, Fichten72 for WEYCOS, Smith72 , and Thomas77 for pointers in EDMS The model used here was in uenced by work of Iizuka75 , as applied to FORIMS Severance76 uses di erential les to maintain backup versions incrementally A technique for creating backups suitable for very large, active databases is presented by Rosenkrantz in Lowenthal78 Recovery using cooperation among processes is de ned by Kim82 Recovery in SYSTEM R is described by Gray81 The block-level recovery scheme, using checkpoints in multiple timeframes, and its performance, was detailed by Lorie77 Audittrails are discussed by Bjork75 ; Sayani in Rustin74 , Menasce79 , and Bhargava81L have evaluation models for recovery actions Access to prior database versions is developed by Adiba80 The two-phase model of transaction processing is due to Eswaran76 It is evaluated by Menasce in Aho82 Undo of transactions is supported by an algorithm of Reuter80.

Some programming languages (such as C++) distinguish between the is-composed-of (composition) and the has-a (aggregation) relationships, but this distinction does not apply in C#, and they are treated as equivalent.

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This process of aggregation (or composition) allows you to build very complex classes by assembling and combining relatively simple classes. The .NET Framework provides a String class to handle text strings. You might create your own Address class out of five text strings (address line 1, address line 2, city, state, and zip code). You might then create a second class, Employee, which has as one of its members an instance of Address.

Specifying Foreign Key Constraints in SQL-92

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Reliability in distributed databases is the focus of a series of conferences sponsored by the IEEE (Bhargava81 , Wiederhold82 ) Fischer82 sets proper checkpoints in multiple sites The primary copy token scheme is due to Minoura81 Reliability in various distributed system implementations is considered by Dadam80 , Hammer80R , Borr81 , and Andler82 Journals Articles on database issues are found in nearly every scienti c publication In Chap 8 we listed some speci c database publications General computer science journals which frequently carry papers on database topics include the Communications (CACM, since 1961) and Journal (JACM, since 1968) of the ACM Survey articles appear in the ACM Computing Surveys (since 1969) and in Computer (since 1970) of the IEEE Computer Society Some database papers also appear in the IEEE Proceedings and the Transactions on Software Engineering (since 1975) The British Computer Society s Computer Journal (since 1962) and Software Practice and Experience (since 1973) often have pragmatic papers The Australian Computer Society has a Journal which carries also database articles BIT (Nordisk Behandlings Informations Tidskrift), published since 1976 by the Regnecentralen (Copenhagen Denmark) and Acta Informatica (since 1971) often have relevant algorithmic papers Papers on computational topics are found in SIAM Journal on Computing and also in Information Processing Letters (since 1971) The ACM-SIGIR produces a newsletter for information retrieval Oriented towards commercial data-processing is the ACM-SIGDB Data Base, produced since 1969 by the SIG on Business Data Processing and the EDP Analyzer, produced since 1964 by Canning Publications, Vista CA Many applications areas have journals which emphasize issues of data management Management oriented papers are published in the Journal of the Society for Management Information Systems (Chicago IL) In the medical area we nd Methods of Information in Medicine (Schattauer Verlag, Stuttgart FRG) and the Journal of Medical Systems (Plenum Publishing) The library eld uses the Annual Review of Information Science and Technology, published by Knowledge Industry Publications, White Plains NY, under sponsorship of the American Society for Information Science Butterworth, London, has begun publication in 1982 of Information Technology: Research and Development.

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