audit_actions maps an audit number («audit trail action type code») to the audit name («action type name»).
Codes 150 through 155 are for olap dml cube objects. These don't have a corresponding SQL command or octdef code.
TODO
select * from audit_actions where name like '%LANGUAGE';
Schema synonyms (CREaTE SCHEMA SYNONYM, DROP SCHEMA SYNONYM) were allegedly scheduled to be added in 12g, but apparently weren't:
select * from audit_actions where action in (222, 224);
See also
dba_audit_trail
system_privilege_map
stmt_audit_option_map
with dco as (select id# action, code name from dvsys.code$)
select
nvl(aud.name, dco.name),
dco.action action_dco,
aud.action action_aud
from
dco full outer join
audit_actions aud on aud.name = dco.name
order by
nvl(dco.action, aud.action);