Location of alert log file in oracle 12c

Starting from oracle database 11g the alert log directory path has the following structure:

ORACLE_BASE/diag/rdbms/LOWER(<db_unique_name>)/<instance_name>/trace

And we can verify the directory path with this query:

SQL> select value from v$diag_info where name = 'Diag Trace';
 VALUE
--------------------------------------------------------------------------------
D:\APP\ADMIN\VIRTUAL\diag\rdbms\primary\primary\trace
 SQL>

The name of the alert.log has ‘alert_<ORACLE_SID>.log‘ format.

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