如果备库控制文件损坏，adg需要继续保持同步，那么如何修复
应该从主库拿最新的控制文件，然后配置一下
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sqlplus / as sysdba
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alter database create standby controlfile as '/tmp/prod_for_standby.ctl';
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rman target /
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backup format='/tmp/prod_standby.ctl' current controlfile for standby;
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backup format='/tmp/prod_standby.ctl' as copy current controlfile for standby;
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run {
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allocate channel d1 device type disk format '/backup/%U';
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allocate channel d2 device type disk format '/backup/%U';
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sql 'alter system archive log current'
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backup database include current controlfile for standby;
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sql 'alter system archive log current';
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backup archivelog all;
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}
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