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 = 39 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' 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 = 'EUROPE' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=820987.88..820987.89 rows=1 width=190) (actual time=15311.593..15311.636 rows=100 loops=1) Buffers: shared hit=1701044 read=176166 -> Sort (cost=820987.88..820987.89 rows=1 width=190) (actual time=15311.590..15311.623 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=1701044 read=176166 -> Merge Join (cost=395374.30..820987.87 rows=1 width=190) (actual time=10930.728..15299.864 rows=4726 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1677 Buffers: shared hit=1701036 read=176166 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7947 width=30) (actual time=1.076..2311.131 rows=7926 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 39)) Rows Removed by Filter: 1992074 Buffers: shared hit=757 read=45984 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=10928.437..11420.715 rows=1602316 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1542519 read=126907 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.158..8923.655 rows=1602640 loops=1) Buffers: shared hit=1542519 read=126907 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.069..200.528 rows=20033 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.024 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.043..174.801 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=0.007..59.375 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 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..0.007 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=0.029..0.403 rows=80 loops=20033) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1540338 read=126907 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.114..0.114 rows=1 loops=6403) Buffers: shared hit=157760 read=3275 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.074..0.109 rows=2 loops=6403) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157760 read=3275 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=6403) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6403 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.048..0.100 rows=4 loops=6403) Buffers: shared hit=151357 read=3275 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.042..0.081 rows=4 loops=6403) Buffers: shared hit=100133 read=3275 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.027..0.029 rows=4 loops=6403) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23159 read=3275 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.011..0.011 rows=1 loops=25612) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76974 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.003..0.004 rows=1 loops=25612) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51224 Total runtime: 15346.760 ms (67 rows) COMMIT; COMMIT