How to solve the problem of Database error reporting ORA-16184

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Error report: ORA-16184: DB_UNIQUE_NAME PROD1 hashes to the same value as DB_UNIQUE_NAME PROD5

Reason: the setting of 'LOG_ARCHIVE_CONFIG='DG_CONFIG= (PROD1,PROD1)' is the same in the pfile file when setting up DG.

Solution: LOG_ARCHIVE_CONFIG='DG_CONFIG= (PROD1,PROD2)'

Sqlplus logs back in to OK.

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