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 = 40 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' 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 = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=803154.93..803154.93 rows=1 width=190) (actual time=8200.595..8200.622 rows=100 loops=1) Buffers: shared hit=1855109 read=20857 written=709 -> Sort (cost=803154.93..803154.93 rows=1 width=190) (actual time=8200.592..8200.606 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=1855109 read=20857 written=709 -> Merge Join (cost=381398.14..803154.92 rows=1 width=190) (actual time=5861.288..8194.769 rows=4592 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1705 Buffers: shared hit=1855101 read=20857 written=709 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7977 width=30) (actual time=0.134..1103.745 rows=7855 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 40)) Rows Removed by Filter: 1992145 Buffers: shared hit=34685 read=12056 written=549 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=5860.882..6189.345 rows=1604009 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1665974 read=4879 written=1 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.079..3578.160 rows=1604080 loops=1) Buffers: shared hit=1665974 read=4879 written=1 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.062..99.593 rows=20051 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.009 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.051..84.336 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=0.007..32.760 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.025..0.025 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..0.008 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=0.013..0.153 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1663793 read=4879 written=1 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.061..0.062 rows=1 loops=6297) Buffers: shared hit=154442 read=3922 written=159 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.039..0.059 rows=2 loops=6297) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154442 read=3922 written=159 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6297) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6297 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.027..0.055 rows=4 loops=6297) Buffers: shared hit=148145 read=3922 written=159 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.024..0.045 rows=4 loops=6297) Buffers: shared hit=97769 read=3922 written=159 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.016..0.018 rows=4 loops=6297) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22072 read=3922 written=159 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=25188) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75697 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=25188) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50376 Planning time: 5.701 ms Execution time: 8237.358 ms (68 rows) COMMIT; COMMIT