WARNING: datafile #849 was not in online backup mode
WARNING: datafile #850 was not in online backup mode
WARNING: datafile #851 was not in online backup mode
WARNING: datafile #852 was not in online backup mode
WARNING: datafile #853 was not in online backup mode
WARNING: datafile #854 was not in online backup mode
WARNING: datafile #855 was not in online backup mode
WARNING: datafile #856 was not in online backup mode
WARNING: datafile #857 was not in online backup mode
ORA-1142 signalled during: ALTER DATABASE END BACKUP...
解決辦法：
如果對(duì)數(shù)據(jù)庫(kù)設(shè)置為結(jié)束熱備份時(shí)日志中才會(huì)報(bào)以上錯(cuò)誤日志信息，因?yàn)闆](méi)有把數(shù)據(jù)庫(kù)設(shè)置為開(kāi)始熱備份的狀態(tài)。

SQL> alter database end backup;
alter database end backup
*
第 1 行出現(xiàn)錯(cuò)誤:
ORA-1142 signalled during: ALTER DATABASE END BACKUP...

SQL> alter database begin backup;

數(shù)據(jù)庫(kù)已更改。

SQL> alter database end backup;

數(shù)據(jù)庫(kù)已更改。

則數(shù)據(jù)庫(kù)日志報(bào)以下信息，不再出現(xiàn)警告信息

alter database begin backup
Completed: alter database begin backup
alter database end backup
Completed: alter database end backup