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 = 37 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=809280.64..809280.65 rows=1 width=190) (actual time=12724.720..12724.751 rows=100 loops=1) Buffers: shared hit=1556970 read=320121 written=11586 -> Sort (cost=809280.64..809280.65 rows=1 width=190) (actual time=12724.717..12724.741 rows=100 loops=1) Sort Key: supplier.s_acctbal, nation.n_name, supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1556970 read=320121 written=11586 -> Merge Join (cost=381650.08..809280.63 rows=1 width=190) (actual time=9781.578..12718.237 rows=4723 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1670 Buffers: shared hit=1556962 read=320121 written=11586 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8115 width=30) (actual time=1.297..1450.501 rows=7994 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 37)) Rows Removed by Filter: 1992006 Buffers: shared hit=1731 read=45010 written=70 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=9779.470..10189.705 rows=1602521 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1399010 read=270416 written=11511 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.151..7753.141 rows=1602640 loops=1) Buffers: shared hit=1399010 read=270416 written=11511 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.088..129.323 rows=20033 loops=1) Join Filter: (nation.n_regionkey = 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=0.010..0.013 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=0.066..111.603 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.018..40.762 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.026..0.026 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=0.005..0.011 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=0.020..0.356 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1396829 read=270416 written=11511 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.071..0.072 rows=1 loops=6393) Buffers: shared hit=156221 read=4695 written=5 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.047..0.069 rows=2 loops=6393) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156221 read=4695 written=5 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6393) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6393 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.031..0.065 rows=4 loops=6393) Buffers: shared hit=149828 read=4695 written=5 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.029..0.054 rows=4 loops=6393) Buffers: shared hit=98684 read=4695 written=5 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.020..0.022 rows=4 loops=6393) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21821 read=4695 written=5 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=25572) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76863 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.002 rows=1 loops=25572) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51144 Planning time: 9.514 ms Execution time: 12772.632 ms (68 rows) COMMIT; COMMIT