How do I see bind variable in Oracle?

[marist89]

You have to set the 10046 event. You can do this by either issuing

alter session set events '10046 trace name context forever, level 4'

if you can alter the session.

Otherwise, as system, you can

exec sys.dbms_system.set_ev(sid, serial#, 10046,4,'');

(where sid, serial# are from v$session of the session you want to trace)
as a dba to enable tracing in an existing session.