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 = 31 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=803057.22..803057.22 rows=1 width=190) (actual time=12739.153..12739.192 rows=100 loops=1) Buffers: shared hit=1627923 read=226746 written=1549 -> Sort (cost=803057.22..803057.22 rows=1 width=190) (actual time=12739.150..12739.179 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=1627923 read=226746 written=1549 -> Merge Join (cost=381398.14..803057.21 rows=1 width=190) (actual time=9784.570..12732.457 rows=4556 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1600 Buffers: shared hit=1627915 read=226746 written=1549 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7974 width=30) (actual time=0.031..1311.282 rows=7788 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 31)) Rows Removed by Filter: 1992212 Buffers: shared hit=11802 read=34939 written=942 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=9784.006..10225.329 rows=1586780 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1466356 read=186712 written=439 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.084..8155.347 rows=1586960 loops=1) Buffers: shared hit=1466356 read=186712 written=439 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.068..137.716 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2169 read=12 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.010 rows=1 loops=1) Filter: (r_name = 'AFRICA'::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..118.392 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=2168 read=12 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.008..40.901 rows=100000 loops=1) Buffers: shared hit=2167 read=12 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.033..0.033 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=0.022..0.377 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1464187 read=186700 written=439 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.069..0.069 rows=1 loops=6156) Buffers: shared hit=149757 read=5095 written=168 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.045..0.067 rows=2 loops=6156) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=149757 read=5095 written=168 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6156) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6156 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.031..0.063 rows=4 loops=6156) Buffers: shared hit=143601 read=5095 written=168 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.028..0.052 rows=4 loops=6156) Buffers: shared hit=94355 read=5093 written=168 -> 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=6156) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=20356 read=5070 written=168 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24624) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=73999 read=23 -> 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=24624) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49246 read=2 Planning time: 5.148 ms Execution time: 12759.606 ms (68 rows) COMMIT; COMMIT