1. First, check whether the current database is in archive mode. 1) select name, log_mode from v $database; the value of log_mode is NOARCHIVELOG, which means the database is in non archive mode. The value of log_mode is ARCHIVELOG, which means the database is in archive mode. 2) archive log list; (This method requires as sysdba) The value of Database log mode is No Archive
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