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that Google can call up almost instantly more than 400,000 images of a red barn from over 1.5 billion images in its database There is a great deal to know about creating a good database, accessing a database from a program, growing a database, and managing a database. Application programmers and database administrators need to understand databases at this level in order to use them efficiently. Even computer scientists focused on other specialties need to know about databases today. For instance, some of the newer operating systems use database technology in their file systems for the storage of all information, not just information formally devoted to a particular database. The benefits to the operating system include speed, space savings, and data security. At a deeper level, computer scientists develop algorithms for sharing access to a database among many users simultaneously. For instance, a site like Amazon.com may serve more that 100,000 users at once, and it s important that each user s choices and purchases be kept distinct from one another. Likewise, when you reserve an airplane seat on-line, it s important that two people on-line at the same time are not promised space in the same seat! Computer scientists also develop algorithms for making backup copies of the database to protect against the possibility of data loss due to equipment failure. For a site like Amazon, such an algorithm must allow backup without first stopping the operation of the primary database, for the site must be up at all times! Algorithms to provide such service reliably and efficiently are very challenging to perfect. It should not be hard to convince you that computers have dramatically changed the way in which human beings live their lives. Technologies such as the Internet and the World Wide Web put a vast amount of information at our fingertips. Instant messenger systems, electronic mail, and cell phones have revolutionized the way in which human beings communicate. Computer surveillance systems are being used by police forces to make the world a safer place to live. While all of these technologies are primarily being used for the betterment of human kind, it is also possible to use these technologies to inflict harm, obtain unauthorized access to information, or to spy on people. Coupled with the ability to develop these technologies is a need to address the social and ethical uses of the technology. It is just as important, perhaps sometimes even more important, to ask questions about the potential impact of a technology on society, as it is to build the technology. As more and more people come to depend on computing technology in their daily lives, computer science must also consider the study of social issues of the technologies that it produces. There is a common misconception that computer science is nothing more than the study of computer hardware and programming. It should be clear to you now that computer science is much more than simply writing programs. It includes the study of computer hardware, computer languages, operating systems, networking, databases, and the social consequences of computing. In order to be effective, a computer scientist must understand and master each of these areas. Further, computer science is a young discipline that is still rapidly evolving since its beginnings in the 1940s. In the next section we will briefly explore the history of computing from both a hardware and software perspective. COMPUTING HISTORY Though computer science is a relatively young field that only began in earnest in the 1940s, interest in computing and computing devices started much earlier. The abacus, a simple counting device invented in Babylonia in the fourth century BC, is considered by many to be the first computing device. In 1614 the Scottish lord John Napier, inventor of logarithms, invented a calculating device consisting of a series of rods (often called bones ) that reduced the complex process of multiplication and division into the relatively simple tasks of addition and subtraction. Some regard his inventions as the first attempt at mechanical computation. Blaise Pascal is often credited with the invention of the first mechanical calculator, the Pascaline, in 1642 (there is evidence that Leonardo DaVinci may have beaten Pascal by 150 years). According to Pascal s memoirs, he developed the machine to help his father with his work as a tax collector. Pascal s device could only add and subtract but it was possible to perform multiplication and division operations using a series of additions or subtractions. What is noteworthy about Pascal s machine is that it was capable of calculating with eight figures, and that subtraction was performed using complement techniques. Subtracting using complementary addition is same technique that is used to implement subtraction in most modern computers.
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