1. EXPORT:
exp system@test owner=test123 file=d:oracleuser.dmp log=d:oracleuserdump.log
rows=y statistics=none feedback=100 indexes=y consistent=y compress=n;
(for individual tables=table1,table2,.....)
2. IMPORT:
imp system@test fromuser=test123 touser=test123 file=d:oracleuser.dmp log=d:oracleuser11.log
ignore=y rows=y indexes=y feedback=100;