BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'GERMANY' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2216138.90..2216140.73 rows=733 width=38) (actual time=24762.974..24762.974 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=698231 read=302329 dirtied=1112 written=356 -> HashAggregate (cost=2216091.19..2216104.01 rows=733 width=38) (actual time=24762.926..24762.927 rows=2 loops=1) Buffers: shared hit=698228 read=302329 dirtied=1112 written=356 -> Nested Loop (cost=498600.05..2215587.63 rows=25178 width=38) (actual time=18539.095..24715.807 rows=24019 loops=1) Buffers: shared hit=698228 read=302329 dirtied=1112 written=356 -> Nested Loop (cost=498600.05..2208406.86 rows=25178 width=16) (actual time=18539.036..24588.718 rows=24019 loops=1) Buffers: shared hit=650190 read=302329 dirtied=1112 written=356 -> Hash Join (cost=498600.05..2201066.80 rows=25206 width=16) (actual time=18538.982..24347.965 rows=24019 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=577981 read=302329 dirtied=1112 written=356 -> Nested Loop (cost=0.00..1700144.84 rows=413971 width=16) (actual time=0.229..4800.094 rows=398309 loops=1) Buffers: shared hit=214032 read=252677 dirtied=1112 written=356 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47495.85 rows=13720 width=4) (actual time=0.189..66.762 rows=13276 loops=1) Index Cond: (p_type = 'SMALL PLATED BRASS'::text) Heap Fetches: 13276 Buffers: shared hit=11326 read=69 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.15 rows=31 width=20) (actual time=0.031..0.346 rows=30 loops=13276) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=202706 read=252608 dirtied=1112 written=356 -> Hash (cost=487114.94..487114.94 rows=918809 width=8) (actual time=18537.919..18537.919 rows=913799 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35696kB Buffers: shared hit=363946 read=49652 -> Hash Join (cost=137001.50..487114.94 rows=918809 width=8) (actual time=3764.280..17870.709 rows=913799 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=363946 read=49652 -> Bitmap Heap Scan on orders (cost=97970.88..421668.56 rows=4594045 width=12) (actual time=2627.101..6077.806 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253875 read=13546 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96822.37 rows=4594045 width=0) (actual time=2447.137..2447.137 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12634 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1136.955..1136.955 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=110071 read=36106 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=20.980..1008.121 rows=300963 loops=1) Buffers: shared hit=110071 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.025..0.079 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=0.004..0.021 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.012..0.012 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=0.009..0.010 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=22.124..187.718 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110069 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.702..14.702 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24019) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72209 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=24019) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48038 Total runtime: 24776.174 ms (64 rows) COMMIT; COMMIT