append data to existing database

[Kevin Hall]

I take a dump of my data mysqldump -q -p$DB_PWD -u $DB_USER -h $DB_HOST $DB_NAME > MyDataFile.sql
my goal is to build an archive server. So say the database contains data from 2004 but if I load the file normally with mysql -u User -pPass Database < MyDataFile.sql

This will overwrite all data and recreate the database. What I need is to append the data on top of what is there. So that I can keep 2004 and add the new file. The databases are identical in structure. I am using mysql Ver 14.7 Distrib 4.1.8, for pc-linux (i686). I would like to do this without replicating the data across or dumping all individual tables I am dealing with millions of records so inserting the rows onto the new database is not an option unless it can be scripted.

Thanks in advance.