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 '%COPPER' 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=829017.45..829017.45 rows=1 width=190) (actual time=23094.807..23094.849 rows=100 loops=1) Buffers: shared hit=1723844 read=133270 written=11443 -> Sort (cost=829017.45..829017.45 rows=1 width=190) (actual time=23094.803..23094.835 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=1723844 read=133270 written=11443 -> Merge Join (cost=395374.30..829017.44 rows=1 width=190) (actual time=16422.833..23080.976 rows=4618 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1633 Buffers: shared hit=1723836 read=133270 written=11443 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8149 width=30) (actual time=0.488..3340.854 rows=7949 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 1)) Rows Removed by Filter: 1992051 Buffers: shared hit=758 read=45983 written=1572 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=16421.844..17179.267 rows=1586823 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1569672 read=83396 written=9740 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.112..13531.319 rows=1586960 loops=1) Buffers: shared hit=1569672 read=83396 written=9740 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.085..227.620 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=0.011..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=0.064..196.978 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=0.012..64.037 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.029..0.029 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..0.016 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=0.052..0.639 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1567491 read=83396 written=9740 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.258..0.258 rows=1 loops=6251) Buffers: shared hit=153406 read=3891 written=131 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.170..0.253 rows=2 loops=6251) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153406 read=3891 written=131 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.011 rows=1 loops=6251) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6251 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.113..0.239 rows=4 loops=6251) Buffers: shared hit=147155 read=3891 written=131 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.100..0.202 rows=4 loops=6251) Buffers: shared hit=97147 read=3891 written=131 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.067..0.071 rows=4 loops=6251) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21992 read=3891 written=131 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.030..0.031 rows=1 loops=25004) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75155 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=25004) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50008 Total runtime: 23203.795 ms (67 rows) COMMIT; COMMIT