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MTBF Computer-system components have very high reliability probabilities The failure rate of modern electronics is not greatly a ected by the number of operations carried out, and hence is speci ed in terms of operational time A typical mean time between failures (MTBF) for a highly loaded digital switching transistor is 40 000 hours This time is equivalent to an error probability of only 0000 025 per hour A moderately large system containing and using 10 000 such components would, however, have a probability of only 078 of avoiding an error in an hour s span or a MTBF of 13 hours The error rate of components is signi cantly reduced by conservative usage and a controlled environment In practice, not all component errors will have a detectable e ect in terms of the computer s results, since not all components are contributing to the operation of the computer at any one time, and hence are not actually in use On highly loaded systems failure rates do increase



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Correlated subqueries often occur in combination with the EXISTS operator. Again, let s start with an example. The query in Listing 9-8 shows all course offerings without registrations. Listing 9-8. Correlated Subquery with EXISTS Operator SQL> select o.* 2 from offerings o 3 where not exists 4 (select r.*





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Mechanical parts of computer systems have higher error rates than electronics Magnetic storage devices, communication lines, and data entry and output devices are quite prone to errors Human beings are essential elements of computer systems and show even higher error rates We can make, however, one important observation about modern disk drives A block will be written either completely or not at all The electrical and mechanical inertia in these systems is typically su cient to allow a write operation, once started, to complete completely and correctly This means that, if blocks are properly managed, a high level of system reliability can be achieved

It is important to realize the continued existence of faults and to provide resources to cope with errors as well as to prevent errors Early detection is needed to stop propagation of errors For types of errors which occur frequently,

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automatic correction or recovery is required Since the same error can be due to more than one fault, the proper recovery procedure may not be obvious Halting the entire system whenever errors occur can have a very high cost not only in terms of system unavailability but also in terms of confusion generated if the cause for a halt is not clear to everyone a ected In a chaotic environment, xes and temporary patches are apt to endanger the database more than a reasonable and consistent error recovery algorithm The formalization of error recovery also enables the application of lessons learned during failure situations, so that the fraction of cases for which the error recovery procedure is correct increases over time The time required to get a system going again is referred to as the mean time to repair (MTTR) In this context repair can range from complete fault identi cation and correction to merely logging of the error occurrence and restarting of the system The MTTR can be reduced by having a duplicated computer system This means that more than twice the number of components have to be maintained, since additional components will be needed to connect the two systems The tradeo between decreased MTBF due to system complexity and increased MTTR has to be carefully evaluated in any system where a high availability of the database is desired

registrations r r.course = o.course r.begindate = o.begindate);

Appendix A: Index For Alternate Terminology, pages 679-688 Cross references for terms with overlapping meaning used by manufacturers and other authors Appendix B: Appendix B: Database Systems, pages 689-698 Comprehensive listing of (then) current prototype or commercial DBMSes Appendix C: Appendix C: Symbols used, pages 699-701 Bibliography: Bibliography, pages 703-734 A selected subset of a very comprehensive bibliography Full BIBLIOGRAPHY in HTML Index: Comprehensive Index, was pages 735-751 Answers : Answers to Exercises, was separate

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BEGINDATE TRAINER LOCATION ----------- -------- -------15-JAN-2001 19-FEB-2001 DALLAS 24-FEB-2001 7788 CHICAGO 18-SEP-2000 BOSTON

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