Hi, I have a statement which produces a high CBO cost but executes very quickly, as shown below. Based on the execution timings, is the cost figure a true representative of the response time? The DB version is 11.1.0.7. Thanks Amir call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.08 0.08 0 10 0 0 Execute 1 0.00 0.00 0 0 0 0 Fetch 54 0.82 0.79 0 18922 0 788 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 56 0.90 0.87 0 18932 0 788 Rows Row Source Operation ------- --------------------------------------------------- 788 HASH GROUP BY (cr?017 pr=0 pw=0 time=7 us costs709 size08608 card224) 2633 NESTED LOOPS (cr932 pr=0 pw=0 timeW2 us costs403 size08608 card224) 2633 NESTED LOOPS (cr593 pr=0 pw=0 timeI5 us costY169 size37920 card224) 2633 NESTED LOOPS (cr?36 pr=0 pw=0 time46 us cost0699 sizeh2752 card224) 2633 NESTED LOOPS (cr79 pr=0 pw=0 time6 us cost 19 size@1212 card329) 1 NESTED LOOPS (cr pr=0 pw=0 time=0 us cost size card=1) 1 VIEW VW_SQ_1 (cr pr=0 pw=0 time=0 us cost=8 size=4 card=1) 1 HASH UNIQUE (cr pr=0 pw=0 time=0 us) 1 HASH JOIN (cr pr=0 pw=0 time=0 us cost=8 size5 card=1) 1 TABLE ACCESS BY INDEX ROWID XMAF_GEN_INT_PARAMS (cr=2 pr=0 pw=0 time=0 us cost=2 size' card=1) 1 INDEX RANGE SCAN PG_IDX1 (cr=1 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 4486804) 215 TABLE ACCESS FULL MTL_PARAMETERS (cr pr=0 pw=0 time=4 us cost=5 size20 card!5) 1 TABLE ACCESS BY INDEX ROWID MTL_PARAMETERS (cr=2 pr=0 pw=0 time=0 us cost=1 size=8 card=1) 1 INDEX UNIQUE SCAN MTL_PARAMETERS_U1 (cr=1 pr=0 pw=0 time=0 us cost=0 size=0 card=1)(object id 7243) 2633 TABLE ACCESS BY INDEX ROWID MTL_ONHAND_QUANTITIES_DETAIL (cr59 pr=0 pw=0 time1 us cost 10 size"9264 card3 29) 2633 INDEX RANGE SCAN MTL_ONHAND_QUANTITIES_N8 (cr pr=0 pw=0 time us costV size=0 card329)(object id 3695328) 2633 TABLE ACCESS BY INDEX ROWID MTL_SYSTEM_ITEMS_B (cru57 pr=0 pw=0 time=0 us cost=2 size card=1) 2633 INDEX UNIQUE SCAN MTL_SYSTEM_ITEMS_B_U1 (crR18 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 7343) 2633 TABLE ACCESS BY INDEX ROWID MTL_SYSTEM_ITEMS_B (cru57 pr=0 pw=0 time=0 us cost=2 size2 card=1) 2633 INDEX UNIQUE SCAN MTL_SYSTEM_ITEMS_B_U1 (crR18 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 7343) -- //www.freelists.org/webpage/oracle-l