Is there a way to find out who made the latest modification to an object such as a table or view in release 7.1?
There are two types of objects whose last modified time is recorded.
In the system table PROJECTION_DELETE_CONCERNS:
Lists projections whose design may cause performance issues when deleting data. This table is generated by calling the EVALUATE_DELETE_PERFORMANCE function.
In the system table COMMENTS, which contains information about comments associated with objects in the database.
Hope that helps,
Although the retention may be limited, you may want to try looking in query_requests:
select start_timestamp, user_name, request from query_requests where request_type = 'DDL';