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able to switchoover to stdy, but after that from stdy, cnt switchback

849425 Newbie
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7/21/2012 02:45:03
Redo transport problem detected: redo transport for database prds has the following error:
ORA-16146: control file enqueue unavailable
Site prds returned ORA-16570.
Data Guard Broker Status Summary:
Type Name Severity Status
Configuration prd_dg Warning ORA-16607
Primary Database prd Error ORA-16778
Physical Standby Database prds Error ORA-16570

I did research and seems the error ORA-16146 is not serious error, but how to fix this? I cannot switchover to primary.

THanks in advance.
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