I have had problems in the past using phpMyAdmin to export a database dump.
I suggest that you try to do a mysqldump from the command line and see if
you get better results. I have found that phpMyAdmin times out too quickly
during a dump, and I don't get good results.
Bob
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Robert L. DeSilets, Jr.
Sr. IT Support Specialist
ISC-CSG
desilets(a)isc.upenn.edu
(215)898-0067