Originally posted by gandolf989
You should do 5 exports, one for each schema. This should make each export file smaller.
I don't see any point in doing so. Why not simply perform full database export? Mind you, there are things that are exported in FULL mode but not in USER mode - what about those?. Cloning a database means creating an exact replica of the database, and the only way to do this (while switching the platform) is by doing FULL exp/imp.

Regarding the size of the dump file: as gandolf989 allready pointed out, you can make export dumping data into many smaller files.