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 = 7 and p_type like '%NICKEL' 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=824311.69..824311.70 rows=1 width=190) (actual time=42169.728..42169.778 rows=100 loops=1) Buffers: shared hit=1807661 read=49637 written=395 -> Sort (cost=824311.69..824311.70 rows=1 width=190) (actual time=42169.722..42169.756 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=1807661 read=49637 written=395 -> Merge Join (cost=395548.32..824311.68 rows=1 width=190) (actual time=34826.385..42156.438 rows=4639 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1622 Buffers: shared hit=1807653 read=49637 written=395 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7977 width=30) (actual time=0.233..2530.249 rows=7899 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 7)) Rows Removed by Filter: 1992101 Buffers: shared hit=46739 read=2 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=34825.701..35513.565 rows=1586905 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1606618 read=46450 written=134 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.093..30435.958 rows=1586960 loops=1) Buffers: shared hit=1606618 read=46450 written=134 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.072..338.111 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=0.010..0.019 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..297.340 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=0.013..113.671 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..0.010 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=0.101..1.479 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1604437 read=46450 written=134 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.506..0.506 rows=1 loops=6261) Buffers: shared hit=154296 read=3185 written=261 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.364..0.500 rows=2 loops=6261) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154296 read=3185 written=261 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.036..0.038 rows=1 loops=6261) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6261 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.242..0.458 rows=4 loops=6261) Buffers: shared hit=148035 read=3185 written=261 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.180..0.325 rows=4 loops=6261) Buffers: shared hit=97947 read=3185 written=261 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.111..0.116 rows=4 loops=6261) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22692 read=3185 written=261 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.050..0.050 rows=1 loops=25044) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75255 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.031..0.032 rows=1 loops=25044) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50088 Total runtime: 42238.248 ms (67 rows) COMMIT; COMMIT