does anyone know, why this happen?, on the normal operation is OK, but when spooling to htm file, this trace file occur. ksedmp: internal or fatal error ORA-00600: internal error code, arguments: [kghstack_alloc], [sql txt in kkslod], [], [], [], [], [], [] Current SQL statement for this session: select '<TR> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||s.username||'</FONT></TD> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||nvl(s.osuser ,' ')||'</FONT></TD> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||s.sid||'</FONT></TD> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||a.owner||'</FONT></TD> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||a.object||'</FONT></TD> <TD ALIGN="CENTER"><FONT FACE="Arial" SIZE="2">'||a.type||'</FONT></TD> </TR>' from sys.v_$session s, sys.v_$access a where s.sid = a.sid and s.username not in ('SYS','SYSTEM') and a.owner not in ('SYS','SYSTEM') order by a.object, a.type, s.username regards ujang