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From Daniel John Debrunner <>
Subject Re: Is HSQLDB compatible with ASF license?
Date Thu, 10 Feb 2005 04:39:26 GMT

> Hi all, I love Derby, but for unit testing it's just too slow. We used
> to use HSQLDB before iBATIS joined ASF, but I switched to Derby it
> because I wasn't sure if HSQLDB was compatible with the ASF license.

There has been some discussion of adding a lower durability option to
Derby, which would allow much faster database creation etc. for unit
testing. Some internal testing flags already exist so I believe it's a
fairly small amount of work to externalize them in a rational way. Come
to the derby-dev list get involved to bring the issue up again (or fix
it yourself)!

I'm not sure how hsqldb can be used as a test database, given that
multiple threads can overwrite each other, due to hsqldb only supporting
dirty read mode (no isolation). Thus if you see incorrect results it
seems you have to work out if hsqldb is the problem or your application.


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