Data and Databases - Database architecture, relational databases
4 important questions on Data and Databases - Database architecture, relational databases
What is a database
Data is processed by the hardware via software. A database is software that runs on the hardware. Hardware stress the data, software processed the data.
What is a Database Management system
Why is Database design important?
• Different approach needed for different types of databases
• Avoid redundant data
• Poorly designed database generated errors, leads to bad decisions, can lead to failure of organization.
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What is data redundancy?
Different and conflicting versions of the same data appear in different places.
Errors more likely to occur when complex entries are made in several different files and recur frequently in one or more files.
Data anomalies develop when required changes in redundant data are not made successfully
Data redundancy is a direct result of storing copies of the same data in more than one place in a database (duplication of data). Increase of use of disk storage and reduces efficiency of data updates.
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