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 = 47 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=827027.31..827027.31 rows=1 width=190) (actual time=16133.289..16133.331 rows=100 loops=1) Buffers: shared hit=1790904 read=69906 written=13 -> Sort (cost=827027.31..827027.31 rows=1 width=190) (actual time=16133.284..16133.310 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=1790904 read=69906 written=13 -> Merge Join (cost=395522.09..827027.30 rows=1 width=190) (actual time=12068.690..16121.670 rows=4735 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1666 Buffers: shared hit=1790896 read=69906 written=13 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8047 width=30) (actual time=0.259..1938.115 rows=8019 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 47)) Rows Removed by Filter: 1991981 Buffers: shared hit=758 read=45983 written=10 -> Sort (cost=395522.09..399521.49 rows=1599760 width=168) (actual time=12067.931..12645.328 rows=1586895 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1633360 read=19708 written=3 -> Nested Loop (cost=1.56..230671.43 rows=1599760 width=168) (actual time=0.112..9904.095 rows=1586960 loops=1) Buffers: shared hit=1633360 read=19708 written=3 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.096..214.619 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=0.008..0.019 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=0.081..187.313 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=0.030..64.607 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.026..0.026 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=0.005..0.012 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=0.038..0.450 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1631179 read=19708 written=3 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.115..0.116 rows=1 loops=6401) Buffers: shared hit=156778 read=4215 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.075..0.112 rows=2 loops=6401) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156778 read=4215 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=6401) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6401 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.051..0.105 rows=4 loops=6401) Buffers: shared hit=150377 read=4215 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.042..0.083 rows=4 loops=6401) Buffers: shared hit=99169 read=4215 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.027..0.030 rows=4 loops=6401) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22210 read=4215 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=25604) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76959 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25604) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51208 Total runtime: 16206.071 ms (67 rows) COMMIT; COMMIT