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 = 25 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=823413.76..823413.76 rows=1 width=190) (actual time=14395.200..14395.228 rows=100 loops=1) Buffers: shared hit=1645334 read=214214 written=88 -> Sort (cost=823413.76..823413.76 rows=1 width=190) (actual time=14395.197..14395.219 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=1645334 read=214214 written=88 -> Merge Join (cost=395548.02..823413.75 rows=1 width=190) (actual time=10059.554..14384.997 rows=4703 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1647 Buffers: shared hit=1645326 read=214214 written=88 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8000 width=30) (actual time=0.156..1823.728 rows=8051 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 25)) Rows Removed by Filter: 1991949 Buffers: shared hit=2803 read=43938 -> Sort (cost=395548.01..399548.01 rows=1600000 width=168) (actual time=10059.020..10692.407 rows=1586498 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1486804 read=166264 written=88 -> Nested Loop (cost=1.56..230670.89 rows=1600000 width=168) (actual time=0.088..7197.405 rows=1586960 loops=1) Buffers: shared hit=1486804 read=166264 written=88 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.076..183.028 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.026..0.039 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.045..159.615 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=0.009..52.374 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: 2kB 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=0.00..10.44 rows=80 width=12) (actual time=0.024..0.324 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1484623 read=166264 written=88 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.162..0.162 rows=1 loops=6350) Buffers: shared hit=155719 read=4012 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.060..0.157 rows=2 loops=6350) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155719 read=4012 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=6350) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6350 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.040..0.151 rows=4 loops=6350) Buffers: shared hit=149369 read=4012 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.035..0.134 rows=4 loops=6350) Buffers: shared hit=98569 read=4012 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.023..0.025 rows=4 loops=6350) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22242 read=4012 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.025..0.026 rows=1 loops=25400) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76327 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=25400) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50800 Total runtime: 14464.930 ms (67 rows) COMMIT; COMMIT