redo坏了，dbopen失败
有redo日志共3组，现在全坏了，db只能启到mount状态，open失败
报错如下：
alter database open
*
ERROR at line 1:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/home/oracle/testdb1/redo03.log'
十万火急：望众侠赐教
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