1. What is a database?
A database is a collection of records or data that is stored in a computer.
2. Name three types of information products that may be produced using a database.
Stringed information
Compressed Information
Spatial Information
3. How does a database manage information?
It organises it into different categories.
4. Provide three examples for each common data type.
Integer: byte, word
Floating-decimals, rational numbers, binary system.
Alphanumeric strings: Letters stringing to represent numbers (i.e. S=0, 1), a binary string, a variable.
5. In a CD collection database, name five of the fields that may be used. For each field describe the data type that each field will contain. Using details about your favourite artist and CDs, make up some data that might be used in each of these fields. Then describe and write out what a record in this database may look like.
Artist: Text, (Artreyu)
Year: Number, (2006)
Title/name of CD: Text, (A Death Grip On Yesterday)
CD Number: Number, (1)
If it’s borrowed or not: Text (Owned)
A record would have to look something like this with all the fields copying the criteria you have used and queries for easy usage.
6. What is meant by the phrase "data has integrity"?
It means that the data is in a logical and easy to follow order.
7. Why is it important that data has integrity?
So that the data can be altered and managed easy and effieciently and can be viewed in a proper order when needed.
8. Explain the meaning of the term 'data'. Give three examples of data that may be input to a computer.
Data refers to information, collected through an experiment, obeservation etc.
3 examples are:
Numbers
Words
Images
9. What is the difference between primary and secondary data sources? Give examples of each.
Primary data: Is known as raw data for a good reason, it means that the data hasnt been procesed and organised for use.
Secondary Data: Secondary data is collected and processed by people other than the researcher in question. Sources of secondary data include census' and large surveys.
Friday, April 17, 2009
Tuesday, February 24, 2009
Homework
ACQUISITION
Jenny acquires data each week by recording on paper the amount raised and the date.
INPUT
She then inputs this data into the spreadsheet using the keyboard.
VALIDATION
The data is validated by inbuilt formulas that check the amount is reasonable.
MAIPULATION
The data for each week is manipulated using a formula to total the amounts.
STORAGE
The file is saved to the hard drive after processing.
RETRIEVAL
On the next collection day, the file is retrieved and new data added.
OUTPUT
Output in the form of a printout is obtained at the end of each month.
COMMUNICATION
Copies are printed, communicating the information to all students by hand.
DISPOSAL
At the end of they ear, when the file is no longer needed, Jenny deletes the file from her computer.
Jenny acquires data each week by recording on paper the amount raised and the date.
INPUT
She then inputs this data into the spreadsheet using the keyboard.
VALIDATION
The data is validated by inbuilt formulas that check the amount is reasonable.
MAIPULATION
The data for each week is manipulated using a formula to total the amounts.
STORAGE
The file is saved to the hard drive after processing.
RETRIEVAL
On the next collection day, the file is retrieved and new data added.
OUTPUT
Output in the form of a printout is obtained at the end of each month.
COMMUNICATION
Copies are printed, communicating the information to all students by hand.
DISPOSAL
At the end of they ear, when the file is no longer needed, Jenny deletes the file from her computer.
Saturday, January 17, 2009
New Kickstart For Wi-Fi
In this article a new waveband is discussed for Wi-Fi. A new band for Wi-Fi is a big deal because it means that with millions of people trying to use a Wi-Fi system there is lots of congestion and "lag" causing the system to slow dramatically.
Glossary
Waveband - A range of frequencies, especially radio frequencies, such as those assigned to communication transmissions.
With a new Waveband the public can use the whole system becomes less congested and more open to higher speeds and download rates for data and applications. It's a bit like after being stuck behind a Volvo driver in a one lane street when suddenly a second lane emerges and you're able to blast past them leaving a cloud of dust and burnt rubber in your wake.
But that is not all, as this new band has been added to laptops and other Wi-Fi using equipment we now have 2 wireless networks for different tasks making this setup very efficient indeed;
"Five gigahertz lets you create what we call an 'entertainment-grade' network for online gaming from your Xbox or PlayStation as well as moving all your video and audio, all your high definition multimedia content, around your home to a TV screen ... At the same time you can keep 2.4GHz for what we'd classify as your data network, which is email and web browsing and things like that." says Graeme Reardon, regional director for Linksys Australia and New Zealand.
Seeing as though this technology has been used before but was not available to the public. This technology is going to be immensely popular until a new Waveband is released. As well as seeing the fact that the Wi-Fi compatibility for this new Waveband will be installed in all Wi-Fi using products with or without your consent deems that this new advancement will be here to stay until a new shiny object comes into play and our easily distractible minds pay more attention to this new contender.
Glossary
Waveband - A range of frequencies, especially radio frequencies, such as those assigned to communication transmissions.
Wi-Fi - Computing a system of wireless access to the internet.
Lag - To fail to keep up a pace.
Lag - To fail to keep up a pace.
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