Oracle 12c how to purge the FGA audit records before a certain date

在下面的步骤前,先了解下这些选项的含义,由于我设置额db_extended所以在过程中我需要选择清除的对象为AUDIT_TRAIL_AUD_STD.

Constant	Type	Value	Description
AUDIT_TRAIL_ALL	PLS_INTEGER	15	All audit trail types. This includes the standard database audit trail (SYS.AUD$ and SYS.FGA_LOG$ tables), operating system (OS) audit trail, and XML audit trail.
AUDIT_TRAIL_AUD_STD	PLS_INTEGER	1	Standard database audit records in the SYS.AUD$ table
AUDIT_TRAIL_DB_STD	PLS_INTEGER	3	Both standard audit (SYS.AUD$) and FGA audit(SYS.FGA_LOG$) records
AUDIT_TRAIL_FGA_STD	PLS_INTEGER	2	Standard database fine-grained auditing (FGA) records in the SYS.FGA_LOG$ table
AUDIT_TRAIL_FILES	PLS_INTEGER	12	Both operating system (OS) and XML audit trails
AUDIT_TRAIL_OS	PLS_INTEGER	4	Operating system audit trail. This refers to the audit records stored in operating system files.
AUDIT_TRAIL_XML	PLS_INTEGER	8	XML audit trail. This refers to the audit records stored in XML files.

begin
  DBMS_AUDIT_MGMT.SET_LAST_ARCHIVE_TIMESTAMP
  (
    audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_FGA_STD,
    last_archive_time => sysdate - 7
  );
end;
/


begin
  DBMS_AUDIT_MGMT.CLEAN_AUDIT_TRAIL
  (
    audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_FGA_STD,
    use_last_arch_timestamp => true
  );
end;
/