数据复制alter database [add|drop] logfile alter database [add|drop] logfile member alter database [add|drop] logfile group alter database [noarchivelog|archivelog] alter database rename file create tablespace alter tablespace [add|rename] datafile alter tablespace [read write|read only] drop tablespace 1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.