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 = 19 and p_type like '%NICKEL' 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=801249.63..801249.64 rows=1 width=190) (actual time=13440.698..13440.725 rows=100 loops=1) Buffers: shared hit=1290952 read=588582 written=4 -> Sort (cost=801249.63..801249.64 rows=1 width=190) (actual time=13440.697..13440.712 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=1290952 read=588582 written=4 -> Merge Join (cost=381398.14..801249.62 rows=1 width=190) (actual time=11042.627..13434.178 rows=4859 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1633 Buffers: shared hit=1290944 read=588582 written=4 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7928 width=30) (actual time=0.109..1114.636 rows=8121 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 19)) Rows Removed by Filter: 1991879 Buffers: shared hit=13935 read=32806 written=4 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=11042.196..11394.540 rows=1602280 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1121673 read=547753 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.094..8933.416 rows=1602640 loops=1) Buffers: shared hit=1121673 read=547753 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.056..114.154 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=0.042..97.689 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=0.009..34.390 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: 10kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.005 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=0.018..0.417 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1119492 read=547753 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.061..0.061 rows=1 loops=6492) Buffers: shared hit=155336 read=8023 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.041..0.059 rows=2 loops=6492) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155336 read=8023 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6492) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6492 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.029..0.055 rows=4 loops=6492) Buffers: shared hit=148844 read=8023 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.045 rows=4 loops=6492) Buffers: shared hit=96908 read=8023 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.021 rows=4 loops=6492) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18858 read=8023 -> 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=25968) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78050 -> 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=25968) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51936 Planning time: 6.293 ms Execution time: 13480.174 ms (68 rows) COMMIT; COMMIT