It should be compatiable with mysql 4.x... You might need to compile with 4.x libraries, but that would be it.
As for how much the data changes.... There are really only 3 tables that change, and one of those is only when you have an option turned on (which is turned off by default).
They are: character_, account, and zone_dump.
The other data is static and only read by the servers. The only time you would update them is when you update your server and your server software should be OFF at that point.
As for character_, it is 1 row per character, and you should not have 2 people logged into the same character at the same time, bad things happen, if that happens, they can be blamed for corrupting their data.
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