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=824339.46..824339.46 rows=1 width=190) (actual time=13418.081..13418.123 rows=100 loops=1) Buffers: shared hit=1639996 read=220814 written=358 -> Sort (cost=824339.46..824339.46 rows=1 width=190) (actual time=13418.077..13418.097 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=1639996 read=220814 written=358 -> Merge Join (cost=395240.92..824339.45 rows=1 width=190) (actual time=9660.794..13407.882 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=1639988 read=220814 written=358 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8035 width=30) (actual time=0.392..1855.262 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=5 -> Sort (cost=395240.86..399233.87 rows=1597205 width=168) (actual time=9659.993..10133.886 rows=1586895 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1482142 read=170926 written=353 -> Nested Loop (cost=1.56..230671.90 rows=1597205 width=168) (actual time=0.104..7690.662 rows=1586960 loops=1) Buffers: shared hit=1482142 read=170926 written=353 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.086..190.078 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=0.022..0.035 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=0.056..162.936 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..56.489 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.024..0.024 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..0.014 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=0.025..0.346 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1479961 read=170926 written=353 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.093..0.093 rows=1 loops=6401) Buffers: shared hit=157088 read=3905 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.058..0.090 rows=2 loops=6401) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157088 read=3905 -> 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=0.038..0.083 rows=4 loops=6401) Buffers: shared hit=150687 read=3905 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.033..0.066 rows=4 loops=6401) Buffers: shared hit=99479 read=3905 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.022..0.024 rows=4 loops=6401) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22520 read=3905 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.009..0.009 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=0.003..0.003 rows=1 loops=25604) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51208 Total runtime: 13453.317 ms (67 rows) COMMIT; COMMIT