OS divides time into number of time slices and depending on priority of tasks to be processed allocates each task a number of time slices

A program that carries out a specific task to assist the operating system

sample rate bit depth bit rate

a row in a table

A buffer downloads the next part of the video and stores it before watching it. helps prevent possible disruptions if there are any delays in streaming.

Vector graphics store information about the components that makeup an image, eg lines, curves and shapes no loss of quality when resized, small file size.

A number that is negative or positive and has decimal or fractional parts.

foreign key in different table

links two or more table using a relationship type

reduces file size by removing some data, eg the number of occurs used in an image. small reduction in quality. permanently removed data, can't be used on text.

cartoons clip art

picture

points per cm

pet colour = black OR pet colour = brown

ADC Analogue to digital converter

portable document format

a macro is a small program which automatically performs a repetitive task. the instructions in a macro will be executed with the click of a button. they add functionality to form and reports.

Real

moving picture experts group

billing system payroll system banking system

SVG ai shapes in word logos

Resolution is the quality of an image. The more pixels, the higher resolution, the larger the file size.

ASCII AND BINARY

one to many one to one many to many

collecting similar for ups of data over a period of time. data is input at an off peak time without human involvement.

jpeg mp3 AAC

grouping together similar groups of data sorting- in ascending or descending order

rich text format

databases are used to for many different things, a social network collects data about you. libraries use databases to know what books you have out on loan

allocating memory storage processing time

involves analysing large volumes of data to produce useful information. helps organisations make decisions and plan for future growth. data mining processes lots of data. when data is in different formats it makes processing data hard

256

Tagged image file format

points per inch

1024

windows audio waveform

portable network graphic

organises use of main memory between data files as rehy are transferred to and from hard disk

integer

JPEG BMP gif png

A pixel is the smallest unit of a digital image that can be displayed and edited.

24

rearranged all the data so that files are stored in adjacent blocks. stores all free blocks together in one place. speeds up time to access files because everything is together in same place.

enables computer to do a particular task such as word processing

searches and filters data that satisfies query criteria

Bitmap graphics store every detail about every individual pixel of an image. Large file size, Loses quality when resized. Can be compressed which reduces file size.

multi user database management systems

win zip slac tiff png

musical instrument digital interface

lossless compression maintains quality of the file, no data loss. temporarily removes unnecessary data to send over internet but is restore once file is reopened. can be used on text

AND OR BETWEEN < > <= >= <> =

it uniquely identifies a record

the ability to transfer data from one computer or one software to another without having to re enter it.

text number date/time currency yes/no (boolean) hyperlink auto number ole object attachment calculated look up wizard

text

enables computer to operate it's hardware and application software

real time batch multi user

Streaming allows a video to be viewed on a website as it downloads in real time

reports are used to present results from queries in an effective manner

Information is data with meaning.

the number of bits used for each sound sample. higher bit depth, higher quality.

Disk defragmentation Task scheduling Data backup and restore Antivirus software

manages storage of data in external devices such as a hard drive

A whole number that can be negative or positive but does not have any decimal or fractional parts.

8

real

The data measures in bits that us processed in a given amount of time

a continuous varying signal that represents physical quantity

two

type check range check length check format check presence check

a backup is a copy of the original data in case it is damaged or lost. you can backup file by uploading last rule onto system, you can backup complete data file (full) or only the data that has changed (incremental)

used to collect data to create a new record, modify existing record or view already creates records

VOLUME - amount of data stored by organisations VARIETY- different types of data VELOCITY- speed at which data can be processed

data compression reduces file saize and maintains quality of the file. this means faster upload and download of these files

a row in a table

dots per inch

data is processed as soon as it is input data files updates before next transaction output generated is processed quickly enough to influence next input

involves many users at different computer sharing same processor is gives each computer a time slice (processor time)

A series of binary digits

give organisations more flexibility in handling data

it detects, located and removes a virus. it scans all data files on a computer and compares these files to a known database of viruses. antivirus can also scan all devices connected to a computer eg usb

Date/Time Character String Integer Real

a software application used to store data

graphics interchange format

involves a range of automatic checks to ensure data at input stage is sensible and within acceptable limits. computer either accepts this data or rejects it and displays error message

refers to large amounts of data stored on a computer system which has the potential to be mines for information

herts Hz

airline booking concert booking online stock control air traffic control

photographs scanned images camera

windows media audio

Data is raw facts and figures which have not been processed and has no meaning.

audio video interleaved

backup shutdown start up software updates

comma separated values

pet type = dog AND pet colour = white

the number of sounds samples captured per second to represent sounds digitally.

automatically performs routine task at set time on computer, processor time is divided amongst number of tasks

a number of records

a virus is a program designed to cause damage to computer or enable hacker to enter computers

joint photographic experts group