问题：
alter tablespace system end backup;
ORA-01146: cannot start online backup - file 1 is already in backup ORA-01110: data file 1: 'C:\ORACLE\ORADATA\ORCL8\SYSTEM01.DBF',布布扣,bubuko.com
ORA-01146: cannot start online backup - file 1 is already in backup ORA-01110: data file 1: 'C:\ORACLE\ORADATA\ORCL8\SYSTEM01.DBF'
原文：http://www.cnblogs.com/lukcyjane/p/3847811.html
