The debugger stuff doesnt seem to work anymore in 11gR1 though

Just hard work.Lot of research and reading ( bugs, other related sites, documenation ).

Have you ever work at Oracle Corporation or touch Oracle by some other partner company.

I really wonder where/how you get/find all these internal things

I really like all of your stuff. Thank you for sharing hidden side of Oracle.

You can invoke OS debuger on event or script in this case:

vi debug.sh

/bin/echo Hello World! $*

SQL> alter system set”_oradbg_pathname”=’/oracle/admin/test/scripts/debug.sh’;

System altered.

SQL> alter system set events ‘logon debugger’;

System altered.

SQL> Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 – 64bit Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining options
-sh-3.1$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.3.0 – Production on Mon Mar 9 23:23:52 2009

Copyright (c) 1982, 2006, Oracle. All Rights Reserved.

Hello World! 13813

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 – 64bit Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining options

SQL>