An Issue of Duplicate Database: edit the initSID when creating the Duplicate Database. the ora file finds that the values of db_file_name_convert are sequential. First write the correspondence between subdirectories and then write the correspondence between parent directories. Otherwise, errors may occur. The following statement is normal: db_file_name_convert = '/u01/app/oracle/oradata/PROD/Disk1', '/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/PROD/disk2','/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/PROD/Disk3', '/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/prod','/u01/app/oracle/oradata/sbdb. Db_file_name_convert = '/u01/app/oracle/oradata/prod','/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/PROD/Disk1', '/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/PROD/disk2','/u01/app/oracle/oradata/sbdb ', '/u01/app/oracle/oradata/PROD/Disk3', '/u01/app/oracle/oradata/sbdb'