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 = 23 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=823265.04..823265.04 rows=1 width=190) (actual time=15287.720..15287.748 rows=100 loops=1) Buffers: shared hit=1637001 read=222563 written=17 -> Sort (cost=823265.04..823265.04 rows=1 width=190) (actual time=15287.716..15287.735 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=1637001 read=222563 written=17 -> Merge Join (cost=395548.94..823265.03 rows=1 width=190) (actual time=10667.675..15277.085 rows=4706 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1645 Buffers: shared hit=1636993 read=222563 written=17 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7979 width=30) (actual time=0.530..2255.673 rows=8031 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 23)) Rows Removed by Filter: 1991969 Buffers: shared hit=758 read=45983 -> Sort (cost=395548.90..399548.90 rows=1600000 width=168) (actual time=10666.699..11338.539 rows=1586861 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1480543 read=172525 written=17 -> Nested Loop (cost=1.56..230671.78 rows=1600000 width=168) (actual time=0.100..8585.801 rows=1586960 loops=1) Buffers: shared hit=1480543 read=172525 written=17 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.078..197.869 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..0.024 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=0.060..171.700 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..60.766 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..0.014 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=0.027..0.389 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1478362 read=172525 written=17 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.133..0.134 rows=1 loops=6351) Buffers: shared hit=155692 read=4055 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.088..0.129 rows=2 loops=6351) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155692 read=4055 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.006 rows=1 loops=6351) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6351 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.059..0.121 rows=4 loops=6351) Buffers: shared hit=149341 read=4055 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.052..0.097 rows=4 loops=6351) Buffers: shared hit=98533 read=4055 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.036..0.039 rows=4 loops=6351) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22179 read=4055 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=25404) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76354 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.004..0.005 rows=1 loops=25404) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50808 Total runtime: 15356.880 ms (67 rows) COMMIT; COMMIT