Search notes:

Oracle: V$DIAG_TRACE_FILE

v$diag_trace_file lists all trace files that are currently present in the Automatic Diagnostic Repository (ADR) in the current container.
select
   adr_home,
   trace_filename,
   change_time,
   modify_time,
   con_id
from
   v$diag_trace_file
order by
   change_time desc;

See also

v$diag_info, v$trace_file_contents.
Oracle Dynamic Performance Views

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