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 = 1 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=827852.46..827852.46 rows=1 width=190) (actual time=13960.424..13960.457 rows=100 loops=1) Buffers: shared hit=1685068 read=172988 written=1 -> Sort (cost=827852.46..827852.46 rows=1 width=190) (actual time=13960.417..13960.443 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=1685068 read=172988 written=1 -> Merge Join (cost=395548.02..827852.45 rows=1 width=190) (actual time=10333.750..13951.079 rows=4660 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1633 Buffers: shared hit=1685060 read=172988 written=1 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8111 width=30) (actual time=0.031..1615.156 rows=8020 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 1)) Rows Removed by Filter: 1991980 Buffers: shared hit=27164 read=19577 written=1 -> Sort (cost=395548.01..399548.01 rows=1600000 width=168) (actual time=10333.368..10948.163 rows=1586885 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1503372 read=149696 -> Nested Loop (cost=1.56..230670.89 rows=1600000 width=168) (actual time=0.064..7058.624 rows=1586960 loops=1) Buffers: shared hit=1503372 read=149696 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.052..169.431 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=0.005..0.011 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=0.043..146.080 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=0.007..48.897 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=0.002..0.004 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=0.024..0.317 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1501191 read=149696 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.087..0.087 rows=1 loops=6293) Buffers: shared hit=154524 read=3715 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.055..0.084 rows=2 loops=6293) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154524 read=3715 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.004 rows=1 loops=6293) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6293 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.036..0.078 rows=4 loops=6293) Buffers: shared hit=148231 read=3715 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.032..0.062 rows=4 loops=6293) Buffers: shared hit=97887 read=3715 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.022..0.024 rows=4 loops=6293) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22253 read=3715 -> 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=25172) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75634 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=25172) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50344 Total runtime: 14021.857 ms (67 rows) COMMIT; COMMIT