I execute sys.dbms_support.start_trace(true,true); I then run a procedure with a query. I exit the session to get my last stat line. I run tkprof sys=no and I do not get an explain plan. If I use the explain= <option> then I get the sqlplus explain plan and not the trace explain plan which has more details (such as LIOs and PIOs for each row source). anyone else have issues with dbms_support ?