WHAT I DO NOT KNOW Flashcards
What is the purpose of a database
It is a program that stores data
How is data structured in a DBMS
Into files fields and records
What is a field
Name given to each separate item of data which is contained within the record
What are some of the data validation
Restricted choice
Length check
What is a table
Collection of related data held in a structured format within database. Consists of fields and records
What is a information system
Combination of computer hardware and software that allows you to create, present, store and process information
What is colour depth
Number of Colors a pixel can be
What is a PDF
Standard file format that captures all elements of printed document as an electronic image
How do you change a sound into a digital signal
By taking a sample every fraction of a second and storing this as a digital value
What is a worm
Malicious program that can replicate itself onto computers. Uses computer network to spread itself
What are the two types of cabling
Twisted pair cabling
Coaxial cables
What is a LAN
Local Access Network
What is a WAN
Wide Area Network
What is CSS
Cascading style sheet - style sheet language used for describing look and formatting of document written in marking language
What is a network
Series of computers linked together so that they can send and receive data
What does ASCII represent
Alphanumeric data
What are variables
Named objects that can store one item of data
What is the control unit
Carries out instructions that are fetched from main memory. Sends out signals that fetch instructions from main memory
What is the address bus
Used to specify address of memory location
What are buses
Multiple lines that connect the processor and main memory and are used to transfer data and send signals between them
What is the data bus
Used to transfer data between main memory and the processor
What is a database
Collection structured of similar info that can be accessed easily
