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 = 44 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=796627.56..796627.56 rows=1 width=190) (actual time=16635.144..16635.194 rows=100 loops=1) Buffers: shared hit=1411777 read=466645 written=1127 -> Sort (cost=796627.56..796627.56 rows=1 width=190) (actual time=16635.139..16635.175 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=1411777 read=466645 written=1127 -> Merge Join (cost=381650.08..796627.55 rows=1 width=190) (actual time=13502.032..16627.458 rows=4740 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1711 Buffers: shared hit=1411769 read=466645 written=1127 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7791 width=30) (actual time=0.025..1228.331 rows=7964 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 44)) Rows Removed by Filter: 1992036 Buffers: shared hit=30433 read=16308 written=26 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=13500.615..14157.359 rows=1602623 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1224302 read=445124 written=1098 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.148..9139.241 rows=1602640 loops=1) Buffers: shared hit=1224302 read=445124 written=1098 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.080..125.948 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=0.007..0.011 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=0.061..108.667 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=0.015..39.159 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.024..0.024 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..0.009 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=0.019..0.426 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1222121 read=445124 written=1098 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.074..0.075 rows=1 loops=6451) Buffers: shared hit=157034 read=5213 written=3 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.049..0.072 rows=2 loops=6451) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157034 read=5213 written=3 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6451) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6451 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.034..0.068 rows=4 loops=6451) Buffers: shared hit=150583 read=5213 written=3 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.031..0.057 rows=4 loops=6451) Buffers: shared hit=98977 read=5211 written=3 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6451) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21424 read=5211 written=3 -> 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=25804) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77553 -> 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=25804) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51606 read=2 Planning time: 9.235 ms Execution time: 16730.778 ms (68 rows) COMMIT; COMMIT