首先 
shutdown;
修改init.ora 文件
archive_log_start=true
archive_log_dest_1='oracle\backup\arc1'
archive_log_dest_2='oracle\backup\arc2'
再次
start mount;
alter database archivelog;
alter database open;

解决方案 »

  1.   

    setp1.shutdown clearly
                            setp2.startup mount
                            setp3.alter database archielog/noarchivelog 
                            setp4.alter databse archivelog;
                            setp5.alter system archive log start(启动自动存档)[archive log start/alter system archive log all]
                            setp6.alter database open;        
                            setp7.full db backup 
                            shutdown;
      

  2.   

    参见:
    http://community.csdn.net/Expert/topic/3868/3868990.xml?temp=.6198999
      

  3.   

    ERICLU5188(ERIC) 说的很对, 支持,