Delete data

[rhymejerky]

I have mysql running on FC3. In the mysql/var directory, I see there are a bunch of host.bin.0000x (where x is a number like, 1,2,3, etc) files. They look like old data in the db. If I do a drop database in mysql, does the data in that db automatically deleted? Also, if I know those host.bin.0000x files are old data, is there any tool to del them safely?

Thanks,
ML