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=821092.41..821092.42 rows=1 width=190) (actual time=15712.263..15712.307 rows=100 loops=1) Buffers: shared hit=1854802 read=27237 written=7 -> Sort (cost=821092.41..821092.42 rows=1 width=190) (actual time=15712.258..15712.282 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1854802 read=27237 written=7 -> Merge Join (cost=395522.09..821092.40 rows=1 width=190) (actual time=10885.559..15700.118 rows=4837 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1701 Buffers: shared hit=1854794 read=27237 written=7 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7899 width=30) (actual time=0.314..2123.456 rows=8044 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 49)) Rows Removed by Filter: 1991956 Buffers: shared hit=40863 read=5878 -> Sort (cost=395522.09..399521.49 rows=1599760 width=168) (actual time=10884.114..11470.267 rows=1604032 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1653639 read=17214 written=7 -> Nested Loop (cost=1.56..230671.43 rows=1599760 width=168) (actual time=0.115..8256.198 rows=1604080 loops=1) Buffers: shared hit=1653639 read=17214 written=7 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.080..211.345 rows=20051 loops=1) Join Filter: (public.nation.n_regionkey = public.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=0.009..0.023 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=0.066..185.112 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.013..61.952 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.028..0.028 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.006..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.031..0.365 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1651458 read=17214 written=7 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.188..0.188 rows=1 loops=6538) Buffers: shared hit=160292 read=4145 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.125..0.183 rows=2 loops=6538) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=160292 read=4145 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=6538) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6538 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.086..0.173 rows=4 loops=6538) Buffers: shared hit=153754 read=4145 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.072..0.131 rows=4 loops=6538) Buffers: shared hit=101450 read=4145 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.050..0.053 rows=4 loops=6538) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22860 read=4145 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.017..0.017 rows=1 loops=26152) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=78590 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=26152) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52304 Total runtime: 15766.938 ms (67 rows) COMMIT; COMMIT