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 = 26 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=821618.32..821618.33 rows=1 width=190) (actual time=12315.002..12315.032 rows=100 loops=1) Buffers: shared hit=1721635 read=136897 written=1441 -> Sort (cost=821618.32..821618.33 rows=1 width=190) (actual time=12314.998..12315.009 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=1721635 read=136897 written=1441 -> Merge Join (cost=395548.02..821618.31 rows=1 width=190) (actual time=8891.076..12307.083 rows=4666 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=1721627 read=136897 written=1441 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7954 width=30) (actual time=0.338..1574.712 rows=7959 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 26)) Rows Removed by Filter: 1992041 Buffers: shared hit=12118 read=34623 written=48 -> Sort (cost=395548.01..399548.01 rows=1600000 width=168) (actual time=8889.308..9436.450 rows=1586715 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1554900 read=98168 written=1389 -> Nested Loop (cost=1.56..230670.89 rows=1600000 width=168) (actual time=0.106..6127.799 rows=1586960 loops=1) Buffers: shared hit=1554900 read=98168 written=1389 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.083..156.035 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=0.009..0.022 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=0.067..134.851 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..47.175 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.025..0.025 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..0.011 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=0.021..0.273 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1552719 read=98168 written=1389 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.082..0.082 rows=1 loops=6311) Buffers: shared hit=154609 read=4106 written=4 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.052..0.079 rows=2 loops=6311) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154609 read=4106 written=4 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.004 rows=1 loops=6311) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6311 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.035..0.073 rows=4 loops=6311) Buffers: shared hit=148298 read=4106 written=4 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.031..0.059 rows=4 loops=6311) Buffers: shared hit=97810 read=4106 written=4 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.020..0.022 rows=4 loops=6311) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21928 read=4106 written=4 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=25244) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75882 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=25244) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50488 Total runtime: 12390.781 ms (67 rows) COMMIT; COMMIT