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ora 16778 redo transport error

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This is

ORA-16778: redo transport error

 means 

the Data Guard broker can't send redo logs to standby(s), usually due to network issues, incorrect TNS/listener settings, missing executables, or parameter conflicts

, requiring checks in the Alert Log, Broker Log, 

v$archive_dest_status

, and confirming TNS entries on both primary/standby, often resolved by fixing TNS connectivity or restarting processes. 

WWhat will happen if we ignore this?

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