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 = 48 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=827974.89..827974.90 rows=1 width=190) (actual time=15153.795..15153.837 rows=100 loops=1) Buffers: shared hit=1852456 read=8160 -> Sort (cost=827974.89..827974.90 rows=1 width=190) (actual time=15153.791..15153.810 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=1852456 read=8160 -> Merge Join (cost=395522.09..827974.88 rows=1 width=190) (actual time=10391.470..15141.994 rows=4795 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1596 Buffers: shared hit=1852448 read=8160 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8071 width=30) (actual time=0.280..2016.134 rows=8046 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 48)) Rows Removed by Filter: 1991954 Buffers: shared hit=46741 -> Sort (cost=395522.09..399521.49 rows=1599760 width=168) (actual time=10390.756..10960.118 rows=1586872 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1648213 read=4855 -> Nested Loop (cost=1.56..230671.43 rows=1599760 width=168) (actual time=0.091..7812.566 rows=1586960 loops=1) Buffers: shared hit=1648213 read=4855 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.070..199.191 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.007..0.014 rows=1 loops=1) Filter: (r_name = 'AFRICA'::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..173.976 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.010..60.828 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.024..0.024 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=0.005..0.014 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=0.025..0.348 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1646032 read=4855 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.202..0.202 rows=1 loops=6391) Buffers: shared hit=157494 read=3305 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.138..0.198 rows=2 loops=6391) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157494 read=3305 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.006 rows=1 loops=6391) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6391 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.097..0.188 rows=4 loops=6391) Buffers: shared hit=151103 read=3305 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.081..0.146 rows=4 loops=6391) Buffers: shared hit=99975 read=3305 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.055..0.058 rows=4 loops=6391) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23117 read=3305 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.020..0.020 rows=1 loops=25564) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76858 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=25564) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51128 Total runtime: 15193.564 ms (67 rows) COMMIT; COMMIT