By the way, if you are using 18.104.22.168, it was recently pointed out to me that you can now do this in a single statement/script using a load buffer block
import database 'App'.'DB' data connect as user identified by password
using multiple rules_file 'LD01', 'LD02', 'LD03', 'LD04', 'LD05', 'LD06', 'LD07', 'LD08'
to load_buffer_block starting with buffer_id 100
on error write to '/z/logs/LDALL.err';
No data commit is necessary it does it automatically.