Comments on my MultiDB Setup ?

Hey guys i know this is the best place to ask

I am sitting with a BIG Multi DB setup Here is the list of the db and there sizes

2.1G blogline_0

1.9G blogline_1

2.4G blogline_2

2.9G blogline_3

2.7G blogline_4

2.7G blogline_5

2.1G blogline_6

2.0G blogline_7

2.3G blogline_8

2.4G blogline_9

2.0G blogline_a

1.9G blogline_b

2.3G blogline_c

2.2G blogline_d

2.0G blogline_e

2.2G blogline_f

297M blogline_global

1) First Problem MySql dont like to load up BIG dbs it hangs and then the page just goes white

I need to clean up the DBs i want to remove all comments form all blogs

So what i need is to have a plug or script that can do this for me.

Please guys i know some one out there has set this up for a customers please let us have it so we can use it with our Multi DB setups please