Buying more hardware can improve performance, sometimes by a factor of 2 or 3. Database structural or procedural changes usually improve performance by a factor of 5 or 10. Some database software changes can improve performance by a factor of 100.
Software performance needs to be considered during design. Performance improvements can be made to a working system, but these performance changes are not typically as dramatic as design changes.
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Given the proper tools and training, professionals can transfer data between any two databases. Unfortunately, corporations typically find themselves unable to mine the data they already have because that data resides in multiple databases.
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News articles reporting exposure of the personal financial data of hundreds of thousands of people is common. Can you be confident this will not happen to you?
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A database is only valuable if the data is accessible to the individuals who can benefit from it. Locking up a database so no one can access it may make it secure, but it also makes it worthless.
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