问题：
Error: [1146] ORA-01146: cannot start online backup - file 1 is already in backup
ORA-01110: data file 1: ‘C:\ORACLE\ORADATA\ORCL8\SYSTEM01.DBF‘
以上问题是指，system这个表空间现在是备份状态
解决：
alter tablespace system end backup;
2022-08-04 14:34:45
问题：
alter tablespace system end backup;