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Just think about the way databases are setup. Databases are built in such a way that changes to the structure does not effect any of the program used to access the databases. Where in a XML file, you would have to actually change some of the code thats parsing the XML file to retrieve data. Databases minimizes space as oppose to having a file increasingly grow and as it grows, the time to access information in files is increasing as well. Databases also restrict changes to it unless made by an authorized administrator and who are right to which tables in the databaes. They can also monitor activity to the changes made and if a system fails data is not lost!
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I would love to change the world, but they won't give me the source code!
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