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 = 42 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=827952.43..827952.43 rows=1 width=190) (actual time=35680.622..35680.659 rows=100 loops=1) Buffers: shared hit=1772592 read=101900 written=27 -> Sort (cost=827952.43..827952.43 rows=1 width=190) (actual time=35680.618..35680.637 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=1772592 read=101900 written=27 -> Merge Join (cost=395548.32..827952.42 rows=1 width=190) (actual time=26289.166..35666.101 rows=4616 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1621 Buffers: shared hit=1772584 read=101900 written=27 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8069 width=30) (actual time=1.213..4982.325 rows=8034 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 42)) Rows Removed by Filter: 1991966 Buffers: shared hit=757 read=45984 written=8 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=26286.437..26843.246 rows=1603983 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1618835 read=52018 written=19 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.850..23758.255 rows=1604080 loops=1) Buffers: shared hit=1618835 read=52018 written=19 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.085..266.274 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=0.012..0.022 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=0.065..230.003 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=0.014..71.906 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=0.007..0.011 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=0.094..1.135 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1616654 read=52018 written=19 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.473..0.473 rows=1 loops=6237) Buffers: shared hit=152992 read=3898 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.330..0.466 rows=2 loops=6237) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152992 read=3898 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.032..0.034 rows=1 loops=6237) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6237 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.221..0.429 rows=4 loops=6237) Buffers: shared hit=146755 read=3898 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.172..0.309 rows=4 loops=6237) Buffers: shared hit=96859 read=3898 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.107..0.110 rows=4 loops=6237) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21888 read=3898 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.047..0.047 rows=1 loops=24948) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=74971 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.028..0.028 rows=1 loops=24948) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=49896 Total runtime: 35723.421 ms (67 rows) COMMIT; COMMIT