書式
$ expdp <username>/<password> directory=<directory object> content=metadata_only schemas=<schema name> dumpfile=<dump file name> LOGFILE=<log file name>
実行例
$ expdp system/manager directory=pump_dir content=metadata_only schemas=scott,hr dumpfile=ddl_scott_hr.dmp LOGFILE=exp_ddl_scott_hr.log