1.使用job清空

SQL> dbms_audit_mgmt.create_purge_job　　(	audit_trail_type=> DBMS_AUDIT_MGMT.AUDIT_TRAIL_UNIFIED,	audit_trail_purge_interval=>12，	audit_trail_purge_name=>'audit_trail_pj',	use_last_arch_timestamp=>TRUE,	container=>dbms_audit_mgmt.container_current);

 2.手动清空

SQL> dbms_audit_mgmt.clean_audit_trail(audit_trail_type=>dbms_audit_mgmt.audit_trail_unified);