BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2191530.01..2191531.84 rows=732 width=38) (actual time=65208.465..65208.465 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=745674 read=267069 dirtied=3059 written=10 -> HashAggregate (cost=2191482.37..2191495.18 rows=732 width=38) (actual time=65208.376..65208.379 rows=2 loops=1) Buffers: shared hit=745671 read=267069 dirtied=3059 written=10 -> Nested Loop (cost=503668.41..2190986.11 rows=24813 width=38) (actual time=36574.248..65079.907 rows=24464 loops=1) Buffers: shared hit=745671 read=267069 dirtied=3059 written=10 -> Nested Loop (cost=503668.41..2183909.44 rows=24813 width=16) (actual time=36574.169..63477.931 rows=24464 loops=1) Buffers: shared hit=696743 read=267069 dirtied=3059 written=10 -> Hash Join (cost=503668.41..2176682.69 rows=24817 width=16) (actual time=36574.121..61832.337 rows=24464 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=623240 read=267069 dirtied=3059 written=10 -> Nested Loop (cost=0.00..1670724.40 rows=408344 width=16) (actual time=0.719..23484.893 rows=402270 loops=1) Buffers: shared hit=233914 read=240221 dirtied=3059 written=10 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46622.80 rows=13427 width=4) (actual time=0.399..851.733 rows=13406 loops=1) Index Cond: (p_type = 'PROMO PLATED BRASS'::text) Heap Fetches: 13406 Buffers: shared hit=794 read=10714 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.65 rows=31 width=20) (actual time=0.179..1.667 rows=30 loops=13406) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=233120 read=229507 dirtied=3059 written=10 -> Hash (cost=492113.57..492113.57 rows=924387 width=8) (actual time=36572.308..36572.308 rows=911388 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35602kB Buffers: shared hit=389323 read=26848 -> Hash Join (cost=139395.44..492113.57 rows=924387 width=8) (actual time=8689.878..35863.412 rows=911388 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=389323 read=26848 -> Bitmap Heap Scan on orders (cost=100364.82..426506.83 rows=4621934 width=12) (actual time=4565.759..16754.691 rows=4561665 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=245146 read=24869 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99209.33 rows=4621934 width=0) (actual time=4414.703..4414.703 rows=4621215 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=13200 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=4123.819..4123.819 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=144177 read=1979 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=50.765..3903.539 rows=299838 loops=1) Buffers: shared hit=144177 read=1979 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.406..0.470 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.370..0.386 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.019..0.019 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.015..0.016 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=49.268..758.999 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=144175 read=1979 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=39.572..39.572 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.063..0.064 rows=1 loops=24464) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73503 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.059..0.060 rows=1 loops=24464) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48928 Total runtime: 65236.725 ms (64 rows) COMMIT; COMMIT