I use oracle 12c , it is old , I will upgrade it soon.
I seems not sure which user have ora_dba permission , I tried this user “as” but got the below error.

Now , I can't access the oracle database , it seems the archiver log is full , I want to access the oracle database but I can not login it.
error
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Oracle.ManagedDataAccess.Client.OracleException (0x80004005): ORA-00257: Archiver error. Connect AS SYSDBA only until resolved.

Could you please suggest how can I fix the Archiver error ? I am new to oracle , how can I find which user have ora_dba permission ?
thanks