> My problem happens when the application checks for a second time, and
> finds a file present. Firebird maintains a lock on the external file,
> so I cannot write to it.
>
> How can I release this lock?

DROP the external table.


BTW, you can also use FBExport which handles NULLs and BLOBs much better.

http://fbexport.sourceforge.net

--

Milan Babuskov
http://www.flamerobin.org


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