PROCEDURE show; PROCEDURE noshow; FUNCTION showing;
When you call PLVfile.show, the trace is turned on (the default is that the trace is not active). Currently, PLVfile offers a trace of the get_line and put_line actions only.
It can be very frustrating to work with UTL_FILE and, by extension, PLVfile. You might think that you have taken all the necessary steps to perform file I/O, but you keep getting "Invalid Operation" errors. The PLVfile trace may well be able to give you the information you need to identify your problem more easily.
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