如何找到上次使用的表？

Question

I have 2 Identical Oracle Tables (Table1 & Table2). Data insertion in both these tables are truncate and then load. Once the data is inserted to a table, a synonym is applied on it. Also the table to be inserted for next load is found out using

SELECT   OBJECT_NAME
     INTO   var1
     FROM   (SELECT   RR.OBJECT_NAME,
                      RANK () OVER (ORDER BY RR.LAST_DDL_TIME ASC) RNK
               FROM   SYS.ALL_OBJECTS RR
              WHERE  RR.OBJECT_NAME IN
                               ('Table1', 'Table2'))
    WHERE   RNK = 1;

However I need an alternate technique for this as DDL_TIME for both these tables becomes same if we grant an access role to any user. Please note we cannot alter the table structure

Answer 1

This is too long for a comment.

You have a poor application design. You are using database metadata for a purpose that it is not intended for. If you need to keep track of things like the time when a user was granted access to a table, you should keep this information explicitly in another table, either wrapping the access control logic in a stored procedure or using a DDL trigger.

A sign that you have a problem is that DDL_TIME isn't doing what you want. This column is doing what it is documented to do and presumably what the database needs it to do. The shortcoming is your re-interpretation of it.