BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 32 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=825630.86..825630.87 rows=1 width=190) (actual time=7232.630..7232.653 rows=100 loops=1) Buffers: shared hit=1680864 read=198987 -> Sort (cost=825630.86..825630.87 rows=1 width=190) (actual time=7232.626..7232.634 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1680864 read=198987 -> Merge Join (cost=395522.09..825630.85 rows=1 width=190) (actual time=4937.625..7228.153 rows=4752 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1695 Buffers: shared hit=1680856 read=198987 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8013 width=30) (actual time=0.050..1073.629 rows=8082 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 32)) Rows Removed by Filter: 1991918 Buffers: shared hit=41278 read=5463 -> Sort (cost=395522.09..399521.49 rows=1599760 width=168) (actual time=4937.136..5295.428 rows=1603810 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1482006 read=188847 -> Nested Loop (cost=1.56..230671.43 rows=1599760 width=168) (actual time=0.090..3264.784 rows=1604080 loops=1) Buffers: shared hit=1482006 read=188847 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.075..99.520 rows=20051 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.020 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.056..85.201 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.003..38.976 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.029..0.029 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.012..0.142 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1482002 read=186670 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.044..0.045 rows=1 loops=6447) Buffers: shared hit=157572 read=4677 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.029..0.043 rows=2 loops=6447) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157572 read=4677 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6447) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6447 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.021..0.040 rows=4 loops=6447) Buffers: shared hit=151125 read=4677 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.019..0.033 rows=4 loops=6447) Buffers: shared hit=99549 read=4677 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.014..0.015 rows=4 loops=6447) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22302 read=4405 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25788) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77247 read=272 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=25788) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51576 Total runtime: 7294.725 ms (67 rows) COMMIT; COMMIT