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 = 9 and p_type like '%STEEL' 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=824511.72..824511.73 rows=1 width=190) (actual time=11426.725..11426.762 rows=100 loops=1) Buffers: shared hit=1647440 read=211641 written=212 -> Sort (cost=824511.72..824511.73 rows=1 width=190) (actual time=11426.722..11426.745 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=1647440 read=211641 written=212 -> Merge Join (cost=395548.83..824511.71 rows=1 width=190) (actual time=7993.463..11417.797 rows=4707 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1624 Buffers: shared hit=1647432 read=211641 written=212 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7982 width=30) (actual time=0.271..1517.349 rows=8077 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 9)) Rows Removed by Filter: 1991923 Buffers: shared hit=756 read=45985 -> Sort (cost=395548.83..399548.83 rows=1600000 width=168) (actual time=7992.641..8630.614 rows=1586929 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1491535 read=161533 written=212 -> Nested Loop (cost=1.56..230671.71 rows=1600000 width=168) (actual time=0.075..5482.079 rows=1586960 loops=1) Buffers: shared hit=1491535 read=161533 written=212 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.051..139.537 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=0.006..0.013 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=0.039..120.739 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=0.008..42.715 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.015..0.015 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..0.004 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..0.247 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1489354 read=161533 written=212 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.072..0.072 rows=1 loops=6331) Buffers: shared hit=155141 read=4123 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.045..0.069 rows=2 loops=6331) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155141 read=4123 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6331) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6331 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.030..0.064 rows=4 loops=6331) Buffers: shared hit=148810 read=4123 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.027..0.052 rows=4 loops=6331) Buffers: shared hit=98162 read=4123 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.018..0.020 rows=4 loops=6331) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22071 read=4123 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=25324) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76091 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=25324) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50648 Total runtime: 11487.266 ms (67 rows) COMMIT; COMMIT