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 = 36 and p_type like '%COPPER' 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=808741.18..808741.19 rows=1 width=190) (actual time=10136.008..10136.039 rows=100 loops=1) Buffers: shared hit=1578748 read=283663 written=21827 -> Sort (cost=808741.18..808741.19 rows=1 width=190) (actual time=10136.005..10136.024 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=1578748 read=283663 written=21827 -> Merge Join (cost=381554.45..808741.17 rows=1 width=190) (actual time=7435.967..10130.272 rows=4760 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1703 Buffers: shared hit=1578740 read=283663 written=21827 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8146 width=30) (actual time=0.540..1265.113 rows=8075 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 36)) Rows Removed by Filter: 1991925 Buffers: shared hit=759 read=45982 written=245 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=7433.505..7898.478 rows=1586934 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1419917 read=233151 written=21556 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.064..5732.982 rows=1586960 loops=1) Buffers: shared hit=1419917 read=233151 written=21556 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.052..107.894 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.014 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=0.042..92.716 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=0.008..34.750 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=0.002..0.004 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..0.263 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1417736 read=233151 written=21556 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.059..0.060 rows=1 loops=6463) Buffers: shared hit=158064 read=4530 written=26 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.038..0.057 rows=2 loops=6463) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158064 read=4530 written=26 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6463) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6463 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.025..0.054 rows=4 loops=6463) Buffers: shared hit=151601 read=4530 written=26 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.023..0.045 rows=4 loops=6463) Buffers: shared hit=99897 read=4530 written=26 -> 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=6463) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22208 read=4530 written=26 -> 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=25852) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77689 -> 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=25852) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51704 Planning time: 5.717 ms Execution time: 10188.975 ms (68 rows) COMMIT; COMMIT