创建完DG后，使用正常，但在alert日志中一直报错：
Thu Feb 19 10:01:34 2009
Errors in file e:\oracle\product\10.2.0\admin\fbhis\bdump\fbhispdg_mrp0_3184.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'Z:\ORADATA\FBHIS\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Thu Feb 19 10:01:34 2009
Errors in file e:\oracle\product\10.2.0\admin\fbhis\bdump\fbhispdg_mrp0_3184.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'Z:\ORADATA\FBHIS\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
看了下，在备库相应路径下没有online redo log。所以报错。
请问，在备库中没有redo log影响备库的作用嘛？因为虽然一直报错，但测试了下，可以应用归档日志。
如果需要在备库中建立online redo log的话，该如何建立？
谢谢！
