I think we have to go back to fundamental concept for this operation ,what does the database table compose from ?, they're from schema+data , to get schema : dbschema , to get data : onpload,sql unload ... I think these're simple way but you can do fast and very well if you have 2 these thing you can create the table in many DBMS

in Unload progress you can use another tools for do this such as onpload or onunload to get data think it's better way than use sql unload . In the use of sql unload you can use "set pdqpriority xxx" to spend resource for improve unload performance but in easy way I recommended use the right tools for right jobs is very well