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 = 2 and p_type like '%COPPER' 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=794752.10..794752.11 rows=1 width=190) (actual time=7951.680..7951.702 rows=100 loops=1) Buffers: shared hit=1679515 read=198849 -> Sort (cost=794752.10..794752.11 rows=1 width=190) (actual time=7951.677..7951.689 rows=100 loops=1) Sort Key: supplier.s_acctbal, nation.n_name, supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 52kB Buffers: shared hit=1679515 read=198849 -> Merge Join (cost=381398.14..794752.09 rows=1 width=190) (actual time=5707.483..7946.678 rows=4756 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1690 Buffers: shared hit=1679507 read=198849 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7761 width=30) (actual time=0.497..978.377 rows=7914 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 2)) Rows Removed by Filter: 1992086 Buffers: shared hit=41278 read=5463 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=5706.269..6036.181 rows=1602629 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1480735 read=188691 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.146..4394.044 rows=1602640 loops=1) Buffers: shared hit=1480735 read=188691 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.095..109.304 rows=20033 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.011..0.014 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=0.067..95.715 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.004..47.959 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.035..0.035 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.43..9.75 rows=80 width=12) (actual time=0.014..0.193 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1480731 read=186514 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.047..0.048 rows=1 loops=6446) Buffers: shared hit=157494 read=4695 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.031..0.046 rows=2 loops=6446) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157494 read=4695 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6446) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6446 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.021..0.042 rows=4 loops=6446) Buffers: shared hit=151048 read=4695 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.019..0.034 rows=4 loops=6446) Buffers: shared hit=99480 read=4695 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.014..0.015 rows=4 loops=6446) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22239 read=4423 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25784) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77241 read=272 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=25784) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51568 Planning time: 9.252 ms Execution time: 7971.679 ms (68 rows) COMMIT; COMMIT