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 = 34 and p_type like '%STEEL' 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=822494.15..822494.16 rows=1 width=190) (actual time=14634.667..14634.706 rows=100 loops=1) Buffers: shared hit=1675851 read=201857 written=14433 -> Sort (cost=822494.15..822494.16 rows=1 width=190) (actual time=14634.663..14634.688 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=1675851 read=201857 written=14433 -> Merge Join (cost=395240.92..822494.14 rows=1 width=190) (actual time=10510.818..14625.020 rows=4755 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1656 Buffers: shared hit=1675843 read=201857 written=14433 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7988 width=30) (actual time=0.409..1991.982 rows=7941 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 34)) Rows Removed by Filter: 1992059 Buffers: shared hit=8021 read=38720 written=184 -> Sort (cost=395240.86..399233.87 rows=1597205 width=168) (actual time=10509.475..11135.085 rows=1602938 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1510610 read=159072 written=14230 -> Nested Loop (cost=1.56..230671.90 rows=1597205 width=168) (actual time=0.138..7719.770 rows=1602960 loops=1) Buffers: shared hit=1510610 read=159072 written=14230 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.089..187.656 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=0.009..0.019 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=0.063..162.389 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=0.008..55.636 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.028..0.028 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=0.005..0.010 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=0.027..0.347 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1508429 read=159072 written=14230 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.099..0.099 rows=1 loops=6411) Buffers: shared hit=157212 read=4065 written=19 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.064..0.095 rows=2 loops=6411) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157212 read=4065 written=19 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.005 rows=1 loops=6411) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6411 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.042..0.088 rows=4 loops=6411) Buffers: shared hit=150801 read=4065 written=19 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.037..0.070 rows=4 loops=6411) Buffers: shared hit=99513 read=4065 written=19 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.024..0.027 rows=4 loops=6411) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22432 read=4065 written=19 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=25644) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77081 -> 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=25644) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51288 Total runtime: 14720.370 ms (67 rows) COMMIT; COMMIT