to tune Derby, the Apache DB project, on O'Reilly.
"There is a big difference in the behavior of a database when it is populated with a small amount of test inputs and when it holds a large amount of data. Usually, you would not address these database performance issues early in the development process, but when the time comes, you should take some action to ensure that the application is working correctly with large amounts of data.
The all-Java open-source database Derby is no exception, so you'll have to make sure it will not be a bottleneck to your application.
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