On a Data Guard Physical Standby, I am getting in the alert log:
Errors in file /u01/app/oracle/diag/rdbms/v1s/V1S1/trace/V1S1_arc1_399861.trc:
ORA-00322: log 41 of thread 2 is not current copy
ORA-00312: online log 41 thread 2: '+RECOC1/V1S/ONLINELOG/group_41.3099.912775569'
ORA-00322: log 41 of thread 2 is not current copy
ORA-00312: online log 41 thread 2: '+DATAC1/V1S/ONLINELOG/group_41.807.912775567'
These errors are written due to a very small timing window, when the SRL header
is being updated to reflect new content from the primary and in the same way
the ARCH process is doing its activity and seeing a CF flag entry that reflects an earlier state.
Check the alert.log for any further issues. As long as ORA-322, ORA-312 is not combined with other issues, you can ignore this error.