I hv a mysql db in my RH linux , there is a very large table in the
db , the file size is about 2G , how can I split the file into two
files - two files physically and one file logically ? is there any
tools to do it ? thx

You can use INNODB with multiples tables spaces

See :

http://www.lasso-developpeur.net/us/...tab=db&lang=us