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where cd is the number of possible combinations and t(try) the time required to try a combination For a three-letter password, d = 3 and c = 26 and the time for the interaction with the system may be t(try) = 3 seconds, so that T (getin) 7 hours If the authentication process is required only infrequently, an arti cial delay in the opening process can increase the safety of the lock An equivalent method is to allow only two or three attempts to enter a password An intruder then has to go again through a full access procedure, maybe requiring about 20 seconds The procedure can be more strict for access to critical data When the security-control o cer using RSS fails to provide his password correctly twice, the entire computer system is shut down Extending the number of combinations is the other alternative to increase safety A practical problem is that long passwords are harder to remember and will be frequently written down; another problem is that passwords are frequently chosen to be initials, middle names, friends names, or other aides-m moire and e hence are easily guessed In order to establish legal responsibility, the accessors who have received a password giving them valuable privileges may be required to sign an agreement to keep the password con dential, and to promptly report any suspected loss of con dentiality A frequent change of passwords can help limit the improper use of leaked passwords Changing passwords puts an additional burden on users unless they are equipped with some automatic password generator which is matched by the receiving system If we invent such a device, we also will have to protect its use Methods beyond passwords are used to increase protection An active authentication procedure is provided by NCSS A user can place an interrogation routine in the system which requests parameters during the authentication process A possible query presents a number to the accessor, who is expected to multiply the number by 3 and add 12 This procedure is the password the user has to remember Authentication methods based on keycards, badges, and so on can positively identify the card and hence the accessor, unless the card is copied, lost, or stolen A card in combination with a password can be very e ective An individual who has valid access to the system may, after initial entry, use the identi cation key to gain access to inappropriate privileges An accessor may also be de ned as a member of two projects It may not be desirable that this user can have both corresponding access rights at the same time These problems requires careful management of access privileges.

The goal of this book is to present an in-depth introduction to database management systems, with an emphasis on how to organize information in a DBMS and to maintain it and retrieve it e ciently, that is, how to design a database and use a DBMS e ectively Not surprisingly, many decisions about how to use a DBMS for a given application depend on what capabilities the DBMS supports e ciently Thus, to use a DBMS well, it is necessary to also understand how a DBMS works The approach taken in this book is to emphasize how to use a DBMS, while covering DBMS implementation and architecture in su cient detail to understand how to design a database Many kinds of database management systems are in use, but this book concentrates on relational systems, which are by far the dominant type of DBMS today The following questions are addressed in the core chapters of this book: 1 Database Design: How can a user describe a real-world enterprise (eg, a university) in terms of the data stored in a DBMS What factors must be considered in deciding how to organize the stored data (s 2, 3, 15, 16, and 17) 2 Data Analysis: How can a user answer questions about the enterprise by posing queries over the data in the DBMS (s 4, 5, 6, and 23) 3 Concurrency and Robustness: How does a DBMS allow many users to access data concurrently, and how does it protect the data in the event of system failures (s 18, 19, and 20) 4 E ciency and Scalability: How does a DBMS store large datasets and answer questions against this data e ciently (s 7, 8, 9, 10, 11, 12, 13, and 14) Later chapters cover important and rapidly evolving topics such as parallel and distributed database management, Internet databases, data warehousing and complex.

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Exercise 6-2. You ve defined a class as a diagram; now try defining one in code. Define a class Book, in which a book has a title, author, and ISBN, and the book can be read or shelved. You don t need to fill in the code for any methods you include; simply include a comment in the body, like we did for the Dog class earlier in the chapter.

the sum Tcyl = k nrt(R + W )/t + nrt(R + W )/t = (k + 1)nrt(R + W )/t The bulk transfer rate for the entire cylinder is hence t = k nrt R k R =t Tcyl k+1R+W no interference 2-18

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A similar reasoning can provide the bulk transfer rate for the estimated value of the seek e ect given in Eq 2-16 Now Tcyl = k nrt(R + W )/t + k nrt(R + W )/t = 2k nrt(R + W )/t and t = k nrt R t R = Tcyl 2 R+W estimate 2-19

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In 3, we introduced you to the intrinsic types built into the C# language Those simple types allow you to hold and manipulate numeric values and strings The true power of C#, however, lies in its capacity to let the programmer define new types to suit particular problems That ability to create new types is what characterizes an object-oriented language You specify new types in C# by declaring and defining classes Particular instances of a class are called objects The difference between a class and an object is the same as the difference between the concept of a Dog and the particular dog who is sitting at your feet as you read this You can t play fetch with the definition of a Dog, only with an instance A Dog class describes what dogs are like; they have weight, height, eye color, hair color, disposition, and so forth.

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