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 = '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=818177.98..818177.99 rows=1 width=190) (actual time=12856.372..12856.399 rows=100 loops=1) Buffers: shared hit=1831107 read=47911 written=4 -> Sort (cost=818177.98..818177.99 rows=1 width=190) (actual time=12856.368..12856.386 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=1831107 read=47911 written=4 -> Merge Join (cost=395548.94..818177.97 rows=1 width=190) (actual time=9103.360..12845.474 rows=4748 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1669 Buffers: shared hit=1831099 read=47911 written=4 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7851 width=30) (actual time=0.254..1678.499 rows=8051 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 25)) Rows Removed by Filter: 1991949 Buffers: shared hit=40745 read=5996 -> Sort (cost=395548.90..399548.90 rows=1600000 width=168) (actual time=9102.634..9595.839 rows=1603635 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1632298 read=38555 written=4 -> Nested Loop (cost=1.56..230671.78 rows=1600000 width=168) (actual time=0.102..7161.740 rows=1604080 loops=1) Buffers: shared hit=1632298 read=38555 written=4 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.077..202.156 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=0.007..0.018 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..176.651 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..60.358 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.027..0.027 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..0.011 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=0.025..0.311 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1630117 read=38555 written=4 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.116..0.116 rows=1 loops=6417) Buffers: shared hit=158056 read=3360 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.073..0.112 rows=2 loops=6417) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158056 read=3360 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.005 rows=1 loops=6417) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6417 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.049..0.104 rows=4 loops=6417) Buffers: shared hit=151639 read=3360 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.043..0.084 rows=4 loops=6417) Buffers: shared hit=100303 read=3360 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.026..0.029 rows=4 loops=6417) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23139 read=3360 -> 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=25668) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77164 -> 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=25668) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51336 Total runtime: 12880.650 ms (67 rows) COMMIT; COMMIT