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 = 21 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=830895.48..830895.48 rows=1 width=190) (actual time=9634.187..9634.226 rows=100 loops=1) Buffers: shared hit=1695119 read=180141 written=281 -> Sort (cost=830895.48..830895.48 rows=1 width=190) (actual time=9634.183..9634.208 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=1695119 read=180141 written=281 -> Merge Join (cost=395548.83..830895.47 rows=1 width=190) (actual time=6532.468..9627.760 rows=4696 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1622 Buffers: shared hit=1695111 read=180141 written=281 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8143 width=30) (actual time=0.369..1348.558 rows=8018 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 21)) Rows Removed by Filter: 1991982 Buffers: shared hit=759 read=45982 written=177 -> Sort (cost=395548.83..399548.83 rows=1600000 width=168) (actual time=6531.437..7125.921 rows=1602805 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1539983 read=129699 written=83 -> Nested Loop (cost=1.56..230671.71 rows=1600000 width=168) (actual time=0.092..4678.255 rows=1602960 loops=1) Buffers: shared hit=1539983 read=129699 written=83 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.059..121.220 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.015 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=0.043..104.592 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=0.006..39.507 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.018..0.018 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=0.004..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=0.016..0.208 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1537802 read=129699 written=83 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.064..0.064 rows=1 loops=6318) Buffers: shared hit=154369 read=4460 written=21 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.041..0.061 rows=2 loops=6318) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154369 read=4460 written=21 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6318) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6318 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.027..0.057 rows=4 loops=6318) Buffers: shared hit=148051 read=4460 written=21 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.025..0.048 rows=4 loops=6318) Buffers: shared hit=97507 read=4460 written=21 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.016..0.018 rows=4 loops=6318) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21854 read=4188 written=21 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=25272) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75653 read=272 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.001..0.002 rows=1 loops=25272) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50544 Total runtime: 9690.965 ms (67 rows) COMMIT; COMMIT