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 = 'SMALL POLISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1722212.75..1722214.56 rows=727 width=38) (actual time=9504.849..9504.850 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=1739341 read=256887 dirtied=505 written=6 -> HashAggregate (cost=1722165.47..1722178.19 rows=727 width=38) (actual time=9504.786..9504.787 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1739338 read=256887 dirtied=505 written=6 -> Hash Join (cost=39444.68..1721683.15 rows=24116 width=38) (actual time=1081.169..9465.824 rows=24190 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1739338 read=256887 dirtied=505 written=6 -> Nested Loop (cost=39443.12..1721229.41 rows=24116 width=16) (actual time=1081.104..9432.246 rows=24190 loops=1) Buffers: shared hit=1739334 read=256887 dirtied=505 written=6 -> Hash Join (cost=39442.82..1713448.07 rows=24116 width=16) (actual time=1081.084..9247.950 rows=24190 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1666641 read=256887 dirtied=505 written=6 -> Nested Loop (cost=412.14..1673724.05 rows=120581 width=20) (actual time=7.144..8093.388 rows=120666 loops=1) Buffers: shared hit=1556570 read=220782 dirtied=505 written=6 -> Nested Loop (cost=411.70..1478315.63 rows=399084 width=16) (actual time=6.913..3839.275 rows=396935 loops=1) Buffers: shared hit=288118 read=176392 dirtied=420 written=4 -> Bitmap Heap Scan on part (cost=411.14..28022.45 rows=13253 width=4) (actual time=6.858..149.170 rows=13229 loops=1) Recheck Cond: ((p_type)::text = 'SMALL POLISHED BRASS'::text) Heap Blocks: exact=11311 Buffers: shared hit=3288 read=8105 written=1 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.82 rows=13253 width=0) (actual time=4.642..4.642 rows=13229 loops=1) Index Cond: ((p_type)::text = 'SMALL POLISHED BRASS'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.12 rows=31 width=20) (actual time=0.027..0.268 rows=30 loops=13229) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=284830 read=168287 dirtied=420 written=3 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=396935) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1268452 read=44390 dirtied=85 written=2 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1070.332..1070.332 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=110071 read=36105 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.210..973.417 rows=300963 loops=1) Buffers: shared hit=110071 read=36105 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.052..0.082 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..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.014..0.015 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=18.671..183.619 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=110069 read=36105 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.110..12.110 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24190) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72693 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.993 ms Execution time: 9505.924 ms (66 rows) COMMIT; COMMIT