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 = 1 and p_type like '%NICKEL' 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=828102.72..828102.73 rows=1 width=190) (actual time=10728.008..10728.041 rows=100 loops=1) Buffers: shared hit=1867046 read=12725 written=1 -> Sort (cost=828102.72..828102.73 rows=1 width=190) (actual time=10728.005..10728.027 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=1867046 read=12725 written=1 -> Merge Join (cost=395548.94..828102.71 rows=1 width=190) (actual time=7361.093..10719.988 rows=4740 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1707 Buffers: shared hit=1867038 read=12725 written=1 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8101 width=30) (actual time=0.026..1406.509 rows=8020 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 1)) Rows Removed by Filter: 1991980 Buffers: shared hit=44092 read=2649 -> Sort (cost=395548.90..399548.90 rows=1600000 width=168) (actual time=7360.493..7914.548 rows=1604012 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1664322 read=6531 -> Nested Loop (cost=1.56..230671.78 rows=1600000 width=168) (actual time=0.066..5470.815 rows=1604080 loops=1) Buffers: shared hit=1664322 read=6531 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.052..162.059 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=0.005..0.013 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=0.041..140.182 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=0.007..50.679 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.017..0.017 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..0.009 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=0.019..0.236 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1662141 read=6531 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.091..0.092 rows=1 loops=6447) Buffers: shared hit=158624 read=3545 written=1 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.060..0.088 rows=2 loops=6447) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158624 read=3545 written=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.005 rows=1 loops=6447) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6447 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.040..0.081 rows=4 loops=6447) Buffers: shared hit=152177 read=3545 written=1 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.035..0.066 rows=4 loops=6447) Buffers: shared hit=100601 read=3545 written=1 -> 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=6447) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23113 read=3545 written=1 -> 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=25788) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77488 -> 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=25788) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51576 Total runtime: 10772.730 ms (67 rows) COMMIT; COMMIT