A relational database is a collection of data items organized as a set of formally-described tables from which data can be accessed or reassembled in many different ways without having to reorganize the database tables. The relational database was invented by E. F. Codd at IBM in 1970. The standard user and application program interface […]
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The following are some of the prominent computer professional bodies in Nigeria. Nigeria Computer Society (NCS) Institute Of Management Information System. (IMIS) Computer Professional Registration Council of Nigeria (CPN) Information Technology Association of Nigeria (CPN) Nigeria Internet Group (NIG) Nigeria Computer Society (NCS) The Nigeria Computer Society (NCS) formed in 1978 as Computer Association of
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Computer personnel are those who assemble, install, repair and operate the computer system. The term equally includes those people who make their living out of the computer industry. They include the following: Database Administrator Software programmer Hardware Engineers System analysts Web developers Computer support specialist Network Administrator Network Engineers Computer Technician Microsoft office specialist Computer
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There are various ways in which viruses can attack computer system; When you download or open attachment in e-mail message or by instant messaging messages Installing unknown program from unreliable and suspicious looking web sites Illegal duplication of software from one computer to another e.g. computer games etc. When you use infected flask h drive
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Computer virus is a software program written with malicious intentions. They are intentionally written by some software developer to cause severe damage for the computer, programs, and data files in which it found itself. A computer virus has the ability to replicates itself by changing other programs to include a copy of itself. Examples of
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The Origins of the internet dates back to1960s when the United State funded research projects of its military agencies to build robust, fault-tolerant and distributed computer network. The internet is a global system of interconnected computer network that use the standard internet protocol suite (TCP/IP) to serve billions of users worldwide. It is a network
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A computer network is a system that connects two or more computers together using a communication link. It describes a processing system with a number of independent, relatively low-speed, online, simultaneously usable workstations. In a network, remotely located computer stations are connected to a centrally located sophisticated, high-speed processor via a communication link (telephone lines,
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A Distributed database (DDB) is a collection of multiple, logical interrelated database distributed over a computer network. A Distributed database management system (DDBMS) is the software that manages the DDB and provides an access mechanism that makes this distribution transparent to the users. A distributed database system is a system that permits physical data storage
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Parallel Database improve processing and input/output speeds by using multiple CPU and disks in parallel. A Parallel Database system seeks to improve performance through parallelization of various operations, such as loading data, building indexes and evaluating queries. In Parallel processing, many operations are performed simultaneously, as opposed to serial processing, in which the computational steps
Crash recovery is the process by which the database is moved back to a consistent and usable state. This is done by rolling back incomplete transactions and completing committed transactions that were still in memory when the crash occurred. When the database is in a consistent and usable state, it has attained what is known
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Data Processing is the process of producing meaningful information from raw data. It describes the series of actions taken to produce useful information by collecting all items of data together and performing operations on them. The aim of data processing is to convert raw data into information. Data: Data represent the raw unprocessed input element
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Data are raw, unorganized or unprocessed facts that need to be processed. Data can be something simple and seemingly random and useless until it is organised. TYPES OF DATA Qualitative data i.e descriptive information Quantitative data i.e numeric information SUBDIVISION OF QUANTITATIVE DATA Continuous data: this can take any value. It is also known
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ICT has turned this world to a global village. Apart from communication, that is, reaching people both far and near; it has also made the work easier and better. Better productivity, salaries, health care and even farming and education. SECTORS WHERE ICT HAS PLAYED MAJOR ROLE Education Banking Industry Commerce EDUCATION ICT is applied in
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COMPONENTS OF A COMPUTER SYSTEM A computer system consists of three main parts otherwise called components. They are : Hardware Software People ware HARDWARE COMPONENT The computer hardware could be defined as the physical parts of the computer that we see, feel and handle. It consists of device for input, processing, storage, output and
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Digitalization is the process of converting information into digital format. This information may represent an object, image, sound, document or a signal (usually an analog signal) organized into discrete set of its points or samples. This is the binary data that computers and many devices with computing capacity (such as digital camera and digital hearing
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SUPER COMPUTER These are the largest, fastest and most expensive computers. The cost is several millions of dollars and the speed is between 600 million to 900 million instructions per second (MIP). Another name for super computer is MONSTER. Scientists in weather forecasting, exploration make use of super computers. It can also be used for
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DIGITAL COMPUTER This is the most common type of computer today. It measures physical quantities by counting. Examples are calculator, digital wrist watches, digital fuel dispenser etc. ANALOGUE COMPUTER This type of computer is used to measure and process continuous data such as speed, temperature, heartbeat etc. Examples are speedometer, thermometer etc. HYBRID
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Consider the table below: Generations Of computers Year of development The Technology Used Characteristics Software Instruction Storage Capacity First 1951-1958 Vacuum tube Very big and slow in operation Machine language Small internal storage Second 1959-1964 Transistor Less heat generation High level & Assembly Core storage Third 1965-1975 100-1000 Chips Introduction of integrated circuit
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FIRST GENERATION OF COMPUTERS Electronic machine which was distinct from mechanical computers evolved about 1945. UNIVAC is a good example of this generation of computers. Computers of this generation were characterized by: They used Vacuum tubes. They were very large and expensive. They were very bulky. They had a low retentive memory. They generated a
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EARLY MECHANICAL COUNTING/CALCULATING DEVICES Abacus Slide rule EARLY ELECTRO-MECHANICAL COUNTING DEVICES John Napier bone Blaize Pascal machine Gottfried Leitbnitz machine Joseph Jacquard Loom Charles Babbage analytical machine EARLY ELECTRONIC COUNTING DEVICES Herman Hollerith punch card John Von Neumann machine Man has put in every effort to have better methods of calculations. As
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