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=806134.99..806135.00 rows=1 width=190) (actual time=15005.105..15005.137 rows=100 loops=1) Buffers: shared hit=1415819 read=462603 written=168 -> Sort (cost=806134.99..806135.00 rows=1 width=190) (actual time=15005.103..15005.124 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=1415819 read=462603 written=168 -> Merge Join (cost=381398.14..806134.98 rows=1 width=190) (actual time=12175.555..14998.437 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=1415811 read=462603 written=168 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8053 width=30) (actual time=0.016..1202.581 rows=7964 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 44)) Rows Removed by Filter: 1992036 Buffers: shared hit=14435 read=32306 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=12174.849..12719.171 rows=1602623 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1244394 read=425032 written=168 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.104..8092.122 rows=1602640 loops=1) Buffers: shared hit=1244394 read=425032 written=168 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.062..120.318 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..0.010 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=0.047..103.557 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..37.477 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.025..0.025 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..0.006 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=0.018..0.375 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1242213 read=425032 written=168 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.062..0.062 rows=1 loops=6451) Buffers: shared hit=156982 read=5265 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.040..0.059 rows=2 loops=6451) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156982 read=5265 -> 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=0.027..0.055 rows=4 loops=6451) Buffers: shared hit=150531 read=5265 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.025..0.045 rows=4 loops=6451) Buffers: shared hit=98923 read=5265 -> 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=21370 read=5265 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=25804) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77553 -> 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: 6.248 ms Execution time: 15071.051 ms (68 rows) COMMIT; COMMIT