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 = 33 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=827880.45..827880.45 rows=1 width=190) (actual time=11054.557..11054.589 rows=100 loops=1) Buffers: shared hit=1799678 read=75602 -> Sort (cost=827880.45..827880.45 rows=1 width=190) (actual time=11054.554..11054.574 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=1799678 read=75602 -> Merge Join (cost=395240.92..827880.44 rows=1 width=190) (actual time=7203.909..11044.819 rows=4690 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=1799670 read=75602 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8124 width=30) (actual time=0.379..1844.524 rows=7979 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 33)) Rows Removed by Filter: 1992021 Buffers: shared hit=2720 read=44021 -> Sort (cost=395240.86..399233.87 rows=1597205 width=168) (actual time=7202.840..7789.889 rows=1602960 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1641835 read=27847 -> Nested Loop (cost=1.56..230671.90 rows=1597205 width=168) (actual time=0.138..5152.640 rows=1602960 loops=1) Buffers: shared hit=1641835 read=27847 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.085..151.347 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=0.008..0.021 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..129.337 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=0.013..45.603 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.025..0.025 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..0.014 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=0.019..0.223 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1639654 read=27847 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.090..0.090 rows=1 loops=6312) Buffers: shared hit=155115 read=3734 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.057..0.086 rows=2 loops=6312) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155115 read=3734 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=6312) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6312 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.037..0.080 rows=4 loops=6312) Buffers: shared hit=148803 read=3734 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.033..0.064 rows=4 loops=6312) Buffers: shared hit=98307 read=3734 -> 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=6312) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22420 read=3734 -> 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=25248) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75887 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=25248) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50496 Total runtime: 11098.043 ms (67 rows) COMMIT; COMMIT