ORA-16651: requirements not met for enabling fast-start failover

DGMGRL> ENABLE FAST_START FAILOVER
Error: ORA-16651: requirements not met for enabling fast-start failover
Failed.

                    开启FAST_START FAILOVER如果遇到如上报错，可通过如下方式解决

其中最大性能要对应异步
MaxPerformance/async
只有最大可用才能对应同步
MaxAvailability/sync

1. DGMGRL> EDIT DATABASE <Physical standby> SET PROPERTY LogXptMode='async';
   
2. Property "logxptmode" updated
   
3. DGMGRL> EDIT DATABASE <Primary database> SET PROPERTY LogXptMode='async';
   
4. Property "logxptmode" updated

1. DGMGRL> show configuration
2. Configuration - configuration_name
4. Protection Mode: MaxPerformance
5. Databases:
6. - Primary database
7. - Physical standby database
10. Fast-Start Failover: DISABLED
12. Configuration Status:
13. SUCCESS

1. DGMGRL> ENABLE FAST_START FAILOVER
2. Enabled.

还有就要将主备库开启闪回数据库

1. sql> alter database flashback on;

备库开启闪回需要先停止应用日志，开启闪回后接着应用日志

1. sql> recover managed standby database cancel;

或

1. dgmgrl> edit database set state=APPLY-OFF;

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