List all recent DDL modifications

set pagesize 200 colsep ' '
col Owner format a20
col Object_Name format a30
col Last_DDL format a20
break on Owner
select Owner, Object_type
Object_Name,
Timestamp Last_DDL
from DBA_OBJECTS
where SysDate - TO_DATE(TimeStamp,'YYYY-MM-DD:HH24:MI:SS') < 1
order by Owner, Object_Name
/