10046 trace comes to mind. It may give some indications as to what has happened, or is happening. Have you checked v$sess_io? You can see if IO is taking place in the session. truss or strace may also be useful. Jared On Sat, 06 Nov 2004 23:58:57 -0800, Jonathan Redshaw <jbredsh@xxxxxxx> wrote: > I am having a specific problem when trying to enable a foreign key > constraint on a medium sized table (300K) rows. The enable constraint is > hanging and I don't see any lock conflicts. Any advice on how to > troubleshoot would be appreciated. > -- > //www.freelists.org/webpage/oracle-l > -- Jared Still Certifiable Oracle DBA and Part Time Perl Evangelist -- //www.freelists.org/webpage/oracle-l