what is data Flashcards
what is data?
it is the differences made in some substance by some actor that makes some difference
in the sense of informing some other actor
what do you need to make data?
a set of differences
if there is no variation then there is no data
how can data be coded?
coded to form symbols
such as a wavelength
tough could = 1
peak = 0
what is a data structure?
data can be coded and formed into physical symbols and formed into larger entities known as data structures
structures can be stored in some way
what can data structures do?
act as messages formed from symbols
what is a digital code?
digital code in which a signal can be sent is usually binary
what is a binary code?
0-1
what is meant by bits?
binary digits
what can all forms of coding be done in?
coding in bits
what is important about bits?
most fundamental way in which symbols can be formed as signals or data stores
what is the power of bots?
it is the basic difference between two things typically done in binary digits
what is capacity normally measured in?
bits
what is important about the medium>
the medium or substance in wchih data is made has an important bearing on the way in which structures are used
what does the differences in substances explain?
the way in which data structures as signals differ from data structures as records
e.g signals such as facial expression disappear shortly after
what does forming data with a persistence substance mean
it can be used to form data stores
what can data stores do?
be used by different actors across different times and location
what does ubiquity mean?
presence everywhere
why are data structures uquiquity?
they are present everywhere in different forms
such as physical and electronic
what are data structures consisted of?
data elements which consists of data items
in an electronic table which is a data element and which is a data item
elements = row items = column
how do you form symbols?
binary digits strings have to be coded into larger structures
what does data types declare?
how data should be used
what is bytes?
measurement od data storage capacity
what is a byte?
by 8, consists of 8 bits
kilobyte?
103
megabyte?
106
gigabyte?
109
terabyte?
1012
petabyte
1015
exabyte
1018
zetayte
1021
what is the importance of data structures?
important to organisations as much action is reliant upon data
where are data structures articulated?
data systems
what types of articulation occurs in a data system?
create
update
delete
read
