I see from the CVS logs that you originated the error_log tool so I thought I'd try you for ideas, and CC zope-dev in case anyone there can help...
I've been having some fun'n'games with Oracle: http://mail.zope.org/pipermail/zope-db/2003-September/002149.html
The weird thing, that's since occurred to me, is that none of these errors are finding their way into the event log via the error_log object.
In fact, they're not showing up in the error_log at all :-S
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