BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED KINGDOM' 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 = 'PROMO BURNISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1721113.35..1721115.18 rows=732 width=38) (actual time=11188.764..11188.765 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=1809315 read=194217 dirtied=56 written=4735 -> HashAggregate (cost=1721065.72..1721078.53 rows=732 width=38) (actual time=11188.681..11188.682 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1809312 read=194217 dirtied=56 written=4735 -> Hash Join (cost=39449.10..1720579.38 rows=24317 width=38) (actual time=1117.078..11144.644 rows=24294 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1809312 read=194217 dirtied=56 written=4735 -> Nested Loop (cost=39447.53..1720121.87 rows=24317 width=16) (actual time=1116.998..11101.279 rows=24294 loops=1) Buffers: shared hit=1809308 read=194217 dirtied=56 written=4735 -> Hash Join (cost=39447.24..1712275.67 rows=24317 width=16) (actual time=1116.978..10882.573 rows=24294 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1736314 read=194217 dirtied=56 written=4735 -> Nested Loop (cost=416.55..1672545.88 rows=121583 width=20) (actual time=10.942..9651.137 rows=120880 loops=1) Buffers: shared hit=1590980 read=193375 dirtied=56 written=4711 -> Nested Loop (cost=416.12..1476755.45 rows=399873 width=16) (actual time=10.647..4551.983 rows=398473 loops=1) Buffers: shared hit=317662 read=148947 dirtied=56 written=3473 -> Bitmap Heap Scan on part (cost=411.40..28063.46 rows=13287 width=4) (actual time=10.520..164.196 rows=13309 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BURNISHED COPPER'::text) Heap Blocks: exact=11446 Buffers: shared hit=3399 read=8131 written=183 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.08 rows=13287 width=0) (actual time=7.450..7.450 rows=13309 loops=1) Index Cond: ((p_type)::text = 'PROMO BURNISHED COPPER'::text) Buffers: shared read=84 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.041..0.318 rows=30 loops=13309) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=399856 Buffers: shared hit=314263 read=140816 dirtied=56 written=3290 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.027..0.027 rows=30 loops=13309) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41143 read=14080 written=341 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=398473) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1273318 read=44428 written=1238 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1103.066..1103.066 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145334 read=842 written=24 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=33.190..968.672 rows=300963 loops=1) Buffers: shared hit=145334 read=842 written=24 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.071..0.109 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=0.013..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.027..0.027 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.019..0.020 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=28.814..175.188 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145332 read=842 written=24 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=19.359..19.359 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=831 written=22 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24294) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72994 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.034..0.034 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.012 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.658 ms Execution time: 11190.039 ms (70 rows) COMMIT; COMMIT