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 = 49 and p_type like '%COPPER' 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=797555.78..797555.78 rows=1 width=190) (actual time=10406.187..10406.213 rows=100 loops=1) Buffers: shared hit=1727283 read=154756 written=139 -> Sort (cost=797555.78..797555.78 rows=1 width=190) (actual time=10406.184..10406.201 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=1727283 read=154756 written=139 -> Merge Join (cost=381650.08..797555.77 rows=1 width=190) (actual time=7702.382..10398.696 rows=4837 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1701 Buffers: shared hit=1727275 read=154756 written=139 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7815 width=30) (actual time=0.269..1379.868 rows=8044 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 49)) Rows Removed by Filter: 1991956 Buffers: shared hit=2244 read=44497 written=29 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=7701.750..8065.699 rows=1604032 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1565461 read=105392 written=104 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.097..5989.256 rows=1604080 loops=1) Buffers: shared hit=1565461 read=105392 written=104 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.074..131.885 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=0.008..0.011 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=0.061..112.265 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..43.250 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=0.005..0.013 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=0.020..0.266 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1563280 read=105392 written=104 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.068..0.068 rows=1 loops=6538) Buffers: shared hit=159570 read=4867 written=6 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.044..0.066 rows=2 loops=6538) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159570 read=4867 written=6 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6538) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6538 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.030..0.061 rows=4 loops=6538) Buffers: shared hit=153032 read=4867 written=6 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.050 rows=4 loops=6538) Buffers: shared hit=100730 read=4865 written=6 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.020 rows=4 loops=6538) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22140 read=4865 written=6 -> 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=26152) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78590 -> 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=26152) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52302 read=2 Planning time: 9.623 ms Execution time: 10466.727 ms (68 rows) COMMIT; COMMIT