I moved my site to another server and tried to use mascon (windows client) to dump the old database onto the new server (both linux, old is mysql 3.23, new is mysql 4).
During the dump (using 'dump directly to server' option) mascon gave several error messages like '1048 - column "pinged" cannot be null'. (Actually this was repeated several (7-8) times, but with different field names of different tables).
I tried to change each problematic field (on the source server) to set 'allow null', and retry, eventually the dump was successful! But I am a bit worried, why this error came up, and if my solution could make any trouble for me in the future?