[Koha] Import into catalogue failed, cannot un-import

[Jeffrey LePage]

Hello all:

Because of a character set issue, an import of some MARC records failed.  I can't simply reverse the import from the web interface.  The import crashed and the web interface doesn't seem to recognize that the import happened.  However, the records are still there in the database tables biblio, biblioitems, and items.

My question is: Can I simply delete all records from these tables (biblio, biblioitems, items)?  Or are there other tables I need to deal with?  Or is there a way to do this from the web interface?  

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P.S.  Bernardo Gonzalez Kriegel informs me that the problem I had with the character set was due to not using UTF-8 encoding.  I believe this is correct, although I haven't yet had a chance to test  it.  Thanks Bernardo!