SS 3 Data Processing (1st, 2nd & 3rd Term)

Data Processing (secondary)

Computer Professional Bodies

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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Data Processing (secondary)

CAREER OPPORTUNITIES IN DATA PROCESSING

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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Data Processing (secondary)

SOURCES OF COMPUTER INFECTION VIRUS | WARNING SIGNS, PREVENTIVE, ANTIVIRUS

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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Data Processing (secondary)

NETWORKING | LAN, MAN, WAN, SERVER, TOPOLOGY

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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Data Processing (secondary)

DISTRIBUTED DATABASE

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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Data Processing (secondary)

PARALLEL DATABASE

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

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Data Processing (secondary)

CRASH RECOVERY

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 (secondary)

DATABASE SECURITY

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 or corporate data.   It is a means of putting in place the different form of information security controls to protect database against compromise of

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Data Processing (secondary)

MAINTENANCE OF COMPUTER II

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 and a registry removal, cleaner. Every PC should be installed with an anti virus, a spyware removal application back up and a registry cleanser. Some

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Data Processing (secondary)

MAINTENANCE OF COMPUTER HARDWARE I

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 information and most times, hardware breaks without notice. Excess heat accelerates the deterioration of the delicate circuits in the system. Dust and dirt are the

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Data Processing (secondary)

DENSE VERSUS SPARSE INDEXES

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. In a dense index, index record appears for every search key value in the file or table. That is every search key in the index

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Data Processing (secondary)

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 the corresponding record of the actual table so that the fields not contained in the index can also be read. Index contains a value and

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Data Processing (secondary)

SS 3 Data Processing Revision

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   SIGNIFICANCE OF DATA MODEL (1) A well-developed data model can foster improved understanding of the organization (2) Data model helps in structuring and organizing

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