Obsolete parameter referenced by dbms_session procedure

Hi all,

I love Oracle as it keeps me employed, but with this upgrade from 7.3.4 to 8.1.6.2, I have not been getting a lot of sleep :-) The latest weirdness I have found (going to metalink shortly) is that the alert log contains many messages about close_cached_open_cursors specifies an obsolete parameter.

First, I said "OK, that's nice".
Then I got to wondering, what exactly was giving the alter session command. I queried dba_source and found only one package that had this parameter specified in one of it's procedures. That package is dbms_session and the procedure is free_unused_user_memory.
This entry in the alert log is always around 6:30 am and I can't seem to track down what would be going on at the time to call this procedure(yet).

I verified that the create date for the package is the same as the date/time of the upgrade so I don't believe this is a case of an older version of the package being around. I have also verified in all 8.1.6.2 installations that the procedure references this parameter.

The problem here is that this procedure is used to return unneeded memory from user sessions to the OS. Since the way Oracle is doing it obviously isn't working, what is? Since the alert log entries only occur at 6:30am I have to assume that Oracle has other ways of doing this and that more than likely it is an application that is calling the procedure, but still, this seems like a bug to me. Anyone have any wisdom to add on this?

--
Dave A