original from Tanel Poder

was looking for source of v$restore point view, helped article from Tanel =)

 alter session set "_dump_qbc_tree"=1;

result is :

 SELECT  "ADDR","INDX","INST_ID","CON_ID","NRSNAME","NRSINCARN","NRSSCN","NRSTIME","NRSFLAGS","NRSRSPTIME","NRSRID","NRSSTM" FROM "SYS"."X$KCCNRS"   "X$KCCNRS" WHERE (con_id IN (0, 3) );

upd: also it can be done with:

 select view_definition from v$fixed_view_definition where view_name='GV$RESTORE_POINT';