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 = 13 and p_type like '%COPPER' 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=803807.22..803807.23 rows=1 width=190) (actual time=9185.036..9185.059 rows=100 loops=1) Buffers: shared hit=1741926 read=134828 written=2968 -> Sort (cost=803807.22..803807.23 rows=1 width=190) (actual time=9185.035..9185.051 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=1741926 read=134828 written=2968 -> Merge Join (cost=381648.19..803807.21 rows=1 width=190) (actual time=6022.050..9178.766 rows=4668 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1715 Buffers: shared hit=1741918 read=134828 written=2968 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7975 width=30) (actual time=0.068..1371.314 rows=7967 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 13)) Rows Removed by Filter: 1992033 Buffers: shared hit=757 read=45984 written=2656 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=6021.410..6644.505 rows=1601885 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1585609 read=83817 written=17 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.099..4413.850 rows=1602640 loops=1) Buffers: shared hit=1585609 read=83817 written=17 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.050..101.079 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=0.036..86.114 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..33.219 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.017..0.017 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=0.015..0.194 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1583428 read=83817 written=17 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.066..0.066 rows=1 loops=6383) Buffers: shared hit=155552 read=5027 written=295 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.043..0.064 rows=2 loops=6383) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155552 read=5027 written=295 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6383) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6383 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.029..0.060 rows=4 loops=6383) Buffers: shared hit=149169 read=5027 written=295 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.027..0.050 rows=4 loops=6383) Buffers: shared hit=98106 read=5026 written=295 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.018..0.020 rows=4 loops=6383) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21384 read=5026 written=295 -> 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=25532) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76722 -> 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=25532) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51063 read=1 Planning time: 5.338 ms Execution time: 9265.700 ms (68 rows) COMMIT; COMMIT