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 = 50 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' 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 = 'MIDDLE EAST' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=821686.10..821686.11 rows=1 width=190) (actual time=24082.312..24082.353 rows=100 loops=1) Buffers: shared hit=1848137 read=29992 written=1235 -> Sort (cost=821686.10..821686.11 rows=1 width=190) (actual time=24082.308..24082.337 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=1848137 read=29992 written=1235 -> Merge Join (cost=395374.30..821686.09 rows=1 width=190) (actual time=17867.225..24068.571 rows=4712 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1692 Buffers: shared hit=1848129 read=29992 written=1235 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7964 width=30) (actual time=2.000..2756.701 rows=7899 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 50)) Rows Removed by Filter: 1992101 Buffers: shared hit=35747 read=10994 written=792 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=17864.091..18437.224 rows=1603151 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475045kB Buffers: shared hit=1655345 read=14934 written=191 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.111..15552.722 rows=1603360 loops=1) Buffers: shared hit=1655345 read=14934 written=191 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.086..255.872 rows=20042 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79958 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.014..0.016 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.057..224.005 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=0.010..74.365 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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..0.008 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=0.067..0.726 rows=80 loops=20042) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1653164 read=14934 written=191 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.299..0.299 rows=1 loops=6404) Buffers: shared hit=157037 read=4064 written=252 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.203..0.293 rows=2 loops=6404) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157037 read=4064 written=252 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.014 rows=1 loops=6404) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6404 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.139..0.277 rows=4 loops=6404) Buffers: shared hit=150633 read=4064 written=252 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.124..0.234 rows=4 loops=6404) Buffers: shared hit=99401 read=4064 written=252 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.085..0.089 rows=4 loops=6404) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22367 read=4064 written=252 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.034..0.034 rows=1 loops=25616) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77034 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=25616) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51232 Total runtime: 24123.027 ms (67 rows) COMMIT; COMMIT