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 = 14 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=803711.24..803711.25 rows=1 width=190) (actual time=8815.820..8815.836 rows=100 loops=1) Buffers: shared hit=1652467 read=223350 written=11596 -> Sort (cost=803711.24..803711.25 rows=1 width=190) (actual time=8815.819..8815.828 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=1652467 read=223350 written=11596 -> Merge Join (cost=381649.95..803711.23 rows=1 width=190) (actual time=5930.931..8810.975 rows=4613 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1732 Buffers: shared hit=1652459 read=223350 written=11596 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7987 width=30) (actual time=0.223..1248.950 rows=8024 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 14)) Rows Removed by Filter: 1991976 Buffers: shared hit=758 read=45983 written=7354 -> Sort (cost=381649.50..385649.50 rows=1600000 width=168) (actual time=5930.278..6519.006 rows=1602504 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1496356 read=173070 written=3547 -> Nested Loop (cost=2.00..216772.37 rows=1600000 width=168) (actual time=0.086..4595.646 rows=1602640 loops=1) Buffers: shared hit=1496356 read=173070 written=3547 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.057..96.648 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=0.006..0.008 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..82.401 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=0.005..32.122 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.018..0.018 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=0.004..0.007 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=0.016..0.206 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1494175 read=173070 written=3547 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.054..0.054 rows=1 loops=6345) Buffers: shared hit=155345 read=4297 written=695 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.035..0.052 rows=2 loops=6345) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155345 read=4297 written=695 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6345) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6345 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.048 rows=4 loops=6345) Buffers: shared hit=149000 read=4297 written=695 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.040 rows=4 loops=6345) Buffers: shared hit=98240 read=4297 written=695 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.015..0.016 rows=4 loops=6345) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21950 read=4297 written=695 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25380) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76290 -> 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=25380) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50760 Planning time: 5.044 ms Execution time: 8863.945 ms (68 rows) COMMIT; COMMIT