BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' 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 POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1756037.23..1756039.06 rows=732 width=38) (actual time=10866.173..10866.174 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=1768013 read=238795 dirtied=593 written=204 -> HashAggregate (cost=1755989.59..1756002.40 rows=732 width=38) (actual time=10866.110..10866.111 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1768010 read=238795 dirtied=593 written=204 -> Hash Join (cost=39455.11..1755493.21 rows=24819 width=38) (actual time=1221.603..10825.889 rows=24360 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1768010 read=238795 dirtied=593 written=204 -> Nested Loop (cost=39453.55..1755026.29 rows=24819 width=16) (actual time=1221.540..10789.167 rows=24360 loops=1) Buffers: shared hit=1768006 read=238795 dirtied=593 written=204 -> Hash Join (cost=39453.26..1747018.11 rows=24819 width=16) (actual time=1221.517..10573.268 rows=24360 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1694789 read=238795 dirtied=593 written=204 -> Nested Loop (cost=422.57..1707273.88 rows=124094 width=20) (actual time=7.849..9281.582 rows=121344 loops=1) Buffers: shared hit=1584719 read=202689 dirtied=593 written=120 -> Nested Loop (cost=422.14..1507435.83 rows=408133 width=16) (actual time=7.769..4305.260 rows=399253 loops=1) Buffers: shared hit=296777 read=170027 dirtied=483 written=101 -> Bitmap Heap Scan on part (cost=421.57..28406.89 rows=13567 width=4) (actual time=7.695..191.995 rows=13296 loops=1) Recheck Cond: ((p_type)::text = 'PROMO POLISHED COPPER'::text) Heap Blocks: exact=11396 Buffers: shared hit=1532 read=9947 written=13 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.18 rows=13567 width=0) (actual time=5.285..5.285 rows=13296 loops=1) Index Cond: ((p_type)::text = 'PROMO POLISHED COPPER'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.71 rows=31 width=20) (actual time=0.030..0.299 rows=30 loops=13296) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=295245 read=160080 dirtied=483 written=88 -> 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=399253) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1287942 read=32662 dirtied=110 written=19 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1209.638..1209.638 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=110070 read=36106 written=84 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.609..1116.238 rows=300963 loops=1) Buffers: shared hit=110070 read=36106 written=84 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.054..0.084 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=0.005..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.031..0.031 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=0.026..0.027 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=20.273..211.500 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=110068 read=36106 written=84 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.274..13.274 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 written=2 -> 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=24360) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73217 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 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=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.420 ms Execution time: 10867.024 ms (66 rows) COMMIT; COMMIT