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 = 35 and p_type like '%NICKEL' 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=829598.78..829598.78 rows=1 width=190) (actual time=13040.394..13040.420 rows=100 loops=1) Buffers: shared hit=1624537 read=240324 written=35152 -> Sort (cost=829598.78..829598.78 rows=1 width=190) (actual time=13040.391..13040.406 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=1624537 read=240324 written=35152 -> Merge Join (cost=395548.83..829598.77 rows=1 width=190) (actual time=9409.891..13031.610 rows=4837 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1723 Buffers: shared hit=1624529 read=240324 written=35152 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8110 width=30) (actual time=0.326..1626.435 rows=8218 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 35)) Rows Removed by Filter: 1991782 Buffers: shared hit=759 read=45982 written=88 -> Sort (cost=395548.83..399548.83 rows=1600000 width=168) (actual time=9408.962..10044.573 rows=1586769 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1464144 read=188924 written=35057 -> Nested Loop (cost=1.56..230671.71 rows=1600000 width=168) (actual time=0.090..6994.415 rows=1586960 loops=1) Buffers: shared hit=1464144 read=188924 written=35057 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.072..171.934 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=5 read=2176 written=144 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.018 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=0.059..150.729 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=4 read=2176 written=144 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.009..63.033 rows=100000 loops=1) Buffers: shared hit=3 read=2176 written=144 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.027..0.027 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..0.012 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=0.022..0.320 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1464139 read=186748 written=34913 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.084..0.084 rows=1 loops=6560) Buffers: shared hit=159626 read=5418 written=7 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.054..0.081 rows=2 loops=6560) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159626 read=5418 written=7 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.004 rows=1 loops=6560) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6560 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.036..0.075 rows=4 loops=6560) Buffers: shared hit=153066 read=5418 written=7 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.032..0.062 rows=4 loops=6560) Buffers: shared hit=100586 read=5418 written=7 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6560) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22585 read=4543 written=7 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=26240) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=78001 read=875 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=26240) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52480 Total runtime: 13109.845 ms (67 rows) COMMIT; COMMIT