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 = 9 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=824261.82..824261.83 rows=1 width=190) (actual time=41847.208..41847.252 rows=100 loops=1) Buffers: shared hit=1812564 read=66344 written=1646 -> Sort (cost=824261.82..824261.83 rows=1 width=190) (actual time=41847.204..41847.233 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=1812564 read=66344 written=1646 -> Merge Join (cost=395548.32..824261.81 rows=1 width=190) (actual time=30536.565..41829.984 rows=4769 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1689 Buffers: shared hit=1812556 read=66344 written=1646 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7976 width=30) (actual time=0.258..5580.745 rows=8022 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 9)) Rows Removed by Filter: 1991978 Buffers: shared hit=5159 read=41582 written=281 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=30535.759..31119.061 rows=1602863 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1648857 read=20825 written=1343 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.273..28230.607 rows=1602960 loops=1) Buffers: shared hit=1648857 read=20825 written=1343 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.155..321.660 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.012..0.030 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.128..280.520 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=0.011..97.163 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.093..0.093 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=0.072..0.079 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=0.112..1.355 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1646676 read=20825 written=1343 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.644..0.644 rows=1 loops=6458) Buffers: shared hit=158540 read=3937 written=22 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.456..0.637 rows=2 loops=6458) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158540 read=3937 written=22 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.046..0.047 rows=1 loops=6458) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6458 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.298..0.585 rows=4 loops=6458) Buffers: shared hit=152082 read=3937 written=22 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.213..0.401 rows=4 loops=6458) Buffers: shared hit=100418 read=3937 written=22 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.133..0.139 rows=4 loops=6458) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22772 read=3937 written=22 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.062..0.063 rows=1 loops=25832) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77646 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.043..0.044 rows=1 loops=25832) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51664 Total runtime: 41880.834 ms (67 rows) COMMIT; COMMIT