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 = 38 and p_type like '%BRASS' 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=809181.12..809181.13 rows=1 width=190) (actual time=10674.872..10674.896 rows=100 loops=1) Buffers: shared hit=1575818 read=306597 written=110 -> Sort (cost=809181.12..809181.13 rows=1 width=190) (actual time=10674.871..10674.880 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=1575818 read=306597 written=110 -> Merge Join (cost=381648.19..809181.11 rows=1 width=190) (actual time=7911.375..10668.802 rows=4883 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1726 Buffers: shared hit=1575810 read=306597 written=110 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8113 width=30) (actual time=0.811..1334.221 rows=8109 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 38)) Rows Removed by Filter: 1991891 Buffers: shared hit=757 read=45984 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=7908.459..8348.305 rows=1602534 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1413361 read=256065 written=110 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.108..6140.949 rows=1602640 loops=1) Buffers: shared hit=1413361 read=256065 written=110 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.073..107.174 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=0.056..91.808 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..34.889 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.031..0.031 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..0.011 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=0.017..0.279 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1411180 read=256065 written=110 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.063..0.063 rows=1 loops=6609) Buffers: shared hit=161692 read=4548 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.040..0.061 rows=2 loops=6609) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=161692 read=4548 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6609) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6609 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.026..0.057 rows=4 loops=6609) Buffers: shared hit=155083 read=4548 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.024..0.047 rows=4 loops=6609) Buffers: shared hit=102211 read=4548 -> 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=6609) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22748 read=4548 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=26436) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=79463 -> 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=26436) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52872 Planning time: 5.701 ms Execution time: 10731.345 ms (68 rows) COMMIT; COMMIT