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 = 44 and p_type like '%STEEL' 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=808586.47..808586.47 rows=1 width=190) (actual time=13351.830..13351.865 rows=100 loops=1) Buffers: shared hit=1683800 read=194622 written=2373 -> Sort (cost=808586.47..808586.47 rows=1 width=190) (actual time=13351.828..13351.850 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=1683800 read=194622 written=2373 -> Merge Join (cost=381593.57..808586.46 rows=1 width=190) (actual time=10233.803..13346.089 rows=4740 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1711 Buffers: shared hit=1683792 read=194622 written=2373 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8101 width=30) (actual time=0.017..1369.362 rows=7964 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 44)) Rows Removed by Filter: 1992036 Buffers: shared hit=5866 read=40875 written=2169 -> Sort (cost=381593.06..385591.78 rows=1599488 width=168) (actual time=10232.870..10842.159 rows=1602623 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1520138 read=149288 written=2 -> Nested Loop (cost=2.00..216772.39 rows=1599488 width=168) (actual time=0.141..6991.616 rows=1602640 loops=1) Buffers: shared hit=1520138 read=149288 written=2 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.089..136.189 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..0.009 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=0.073..117.495 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=0.039..41.592 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.016..0.016 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..0.008 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=0.024..0.316 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1517957 read=149288 written=2 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.062..0.063 rows=1 loops=6451) Buffers: shared hit=157788 read=4459 written=202 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.041..0.060 rows=2 loops=6451) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157788 read=4459 written=202 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6451) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6451 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.056 rows=4 loops=6451) Buffers: shared hit=151337 read=4459 written=202 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.025..0.047 rows=4 loops=6451) Buffers: shared hit=99729 read=4459 written=202 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.017..0.019 rows=4 loops=6451) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22177 read=4458 written=202 -> 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=25804) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77552 read=1 -> 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=25804) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51608 Planning time: 4.321 ms Execution time: 13419.669 ms (68 rows) COMMIT; COMMIT