Data Processing/Information Processing

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… Read More »DATA AND INFORMATION

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… Read More »ICT APPLICATION IN EVERYDAY LIFE

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… Read More »DIGITALIZATION OF DATA

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… Read More »DIGITALIZATION OF DATA

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… Read More »CLASSIFICATION OF COMPUTERS BY SIZE

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… Read More »CLASSIFICATION OF COMPUTER BY TYPES

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… Read More »HISTORY OF COMPUTERS

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… Read More »GENERATIONS OF COMPUTERS

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… Read More »HISTORY OF COMPUTING

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… Read More »CRASH RECOVERY

DEFINITION OF DATA SECURITY Data security is the practice of keeping data protected from corruption and unauthorized access. The focus behind data security is to ensure privacy while protecting personal… Read More »DATABASE SECURITY

Maintenance is highly essential in order to prolong its contributing functionality. SOFTWARE MAINTENANCE The maintenance of programs inside the computer system such as virus, a spyware removal, back up software… Read More »MAINTENANCE OF COMPUTER II

Maintenance of computer hardware is a way of taking care, repairing and replacing broken and failing computer hardware. Maintenance is necessary on computer to avoid hardware failure or loosing valuable… Read More »MAINTENANCE OF COMPUTER HARDWARE I

DENSE INDEX This is said to be dense if it contains (at least) one data entry for every search key value that appears in a record in the indexed file.… Read More »DENSE VERSUS SPARSE INDEXES

An Index is a copy of database table that has been reduced to certain fields and the copy is always in sorted form. The index also contains a pointer to… Read More »INDEXES

DEFINITION OF DATA MODEL Is the process of structuring and organizing data.   TYPES OF DATA MODELS (1) Flat (2) Hierarchical (3) Network (4) Relational (5) Object-Relational and (6)Star Schema… Read More »SS 3 Data Processing Revision