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 = 37 and p_type like '%STEEL' 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=822533.95..822533.95 rows=1 width=190) (actual time=28363.763..28363.810 rows=100 loops=1) Buffers: shared hit=1640809 read=238610 written=10059 -> Sort (cost=822533.95..822533.95 rows=1 width=190) (actual time=28363.760..28363.787 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=1640809 read=238610 written=10059 -> Merge Join (cost=395374.30..822533.94 rows=1 width=190) (actual time=20798.656..28349.622 rows=4739 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1692 Buffers: shared hit=1640801 read=238610 written=10059 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7986 width=30) (actual time=3.594..3915.372 rows=7994 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 37)) Rows Removed by Filter: 1992006 Buffers: shared hit=763 read=45978 written=143 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=20793.666..21537.198 rows=1603965 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1484545 read=186308 written=9897 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.140..13746.995 rows=1604080 loops=1) Buffers: shared hit=1484545 read=186308 written=9897 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.108..226.872 rows=20051 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=1609 read=572 written=12 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.016..0.029 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=0.083..196.663 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=1608 read=572 written=12 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.015..69.440 rows=100000 loops=1) Buffers: shared hit=1607 read=572 written=12 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.033..0.033 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=0.011..0.018 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=0.047..0.641 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1482936 read=185736 written=9885 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.301..0.301 rows=1 loops=6431) Buffers: shared hit=155493 read=6324 written=19 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.207..0.295 rows=2 loops=6431) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155493 read=6324 written=19 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.011..0.013 rows=1 loops=6431) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6431 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.143..0.279 rows=4 loops=6431) Buffers: shared hit=149062 read=6324 written=19 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.130..0.239 rows=4 loops=6431) Buffers: shared hit=97614 read=6324 written=19 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.086..0.090 rows=4 loops=6431) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22037 read=4607 written=19 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.035..0.035 rows=1 loops=25724) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75577 read=1717 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=25724) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51448 Total runtime: 28463.039 ms (67 rows) COMMIT; COMMIT