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 = 47 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=821336.99..821337.00 rows=1 width=190) (actual time=6055.991..6056.012 rows=100 loops=1) Buffers: shared hit=1674479 read=198831 -> Sort (cost=821336.99..821337.00 rows=1 width=190) (actual time=6055.985..6055.995 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=1674479 read=198831 -> Merge Join (cost=395374.30..821336.98 rows=1 width=190) (actual time=4220.045..6051.555 rows=4692 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1543 Buffers: shared hit=1674471 read=198831 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7955 width=30) (actual time=0.185..937.258 rows=8019 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 47)) Rows Removed by Filter: 1991981 Buffers: shared hit=41278 read=5463 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=4219.516..4450.378 rows=1602900 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1480923 read=188759 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.132..3192.544 rows=1602960 loops=1) Buffers: shared hit=1480923 read=188759 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.090..109.435 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.011 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.059..95.114 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.003..49.156 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> 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=0.003..0.009 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=0.012..0.137 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1480919 read=186582 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.037..0.037 rows=1 loops=6235) Buffers: shared hit=152270 read=4609 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.024..0.035 rows=2 loops=6235) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152270 read=4609 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6235) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6235 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.017..0.032 rows=4 loops=6235) Buffers: shared hit=146035 read=4609 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.015..0.026 rows=4 loops=6235) Buffers: shared hit=96155 read=4609 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.012..0.013 rows=4 loops=6235) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21468 read=4337 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=24940) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=74687 read=272 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=24940) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=49880 Total runtime: 6069.319 ms (67 rows) COMMIT; COMMIT