Michael Segel wrote:

<>Eeewwww, apply the KISS rule. Where are the temp tables actually created?
In memory only? In /tmp? Or in some place where the JVM dictates? Or cwd?
(Current Working Directory).
If you had clicked on the second link I had, you would know the answer!

  1. For the read-only database, set the property derby.storage.tempDirectory to a writable location. Derby needs to write to temporary files for large sorts required by such SQL statements as ORDER BY, UNION, DISTINCT, and GROUP BY. For more information about this property, see Tuning Derby.
    derby.storage.tempDirectory=c:/temp/mytemp



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