BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'RUSSIA' 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 = 'STANDARD PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1779569.66..1779571.48 rows=730 width=38) (actual time=15817.033..15817.034 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=1901573 read=418417 dirtied=416 written=8107 -> HashAggregate (cost=1779522.16..1779534.94 rows=730 width=38) (actual time=15816.982..15816.984 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1901570 read=418417 dirtied=416 written=8107 -> Hash Join (cost=39460.86..1779020.78 rows=25069 width=38) (actual time=1484.114..15763.486 rows=24613 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1901570 read=418417 dirtied=416 written=8107 -> Nested Loop (cost=39459.30..1778549.18 rows=25069 width=16) (actual time=1484.052..15713.034 rows=24613 loops=1) Buffers: shared hit=1901566 read=418417 dirtied=416 written=8107 -> Hash Join (cost=39459.01..1770452.26 rows=25094 width=16) (actual time=1484.031..15482.777 rows=24613 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1827699 read=418298 dirtied=416 written=8107 -> Nested Loop (cost=428.32..1730700.11 rows=125472 width=20) (actual time=10.802..13864.126 rows=123557 loops=1) Buffers: shared hit=1696013 read=403808 dirtied=416 written=8107 -> Nested Loop (cost=427.89..1527941.62 rows=414102 width=16) (actual time=10.670..5900.820 rows=405813 loops=1) Buffers: shared hit=218580 read=255747 dirtied=416 written=4830 -> Bitmap Heap Scan on part (cost=427.32..28676.42 rows=13793 width=4) (actual time=10.581..120.815 rows=13533 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD PLATED BRASS'::text) Heap Blocks: exact=11578 Buffers: shared hit=7477 read=4185 written=123 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..423.88 rows=13793 width=0) (actual time=7.325..7.325 rows=13533 loops=1) Index Cond: ((p_type)::text = 'STANDARD PLATED BRASS'::text) Buffers: shared hit=1 read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.39 rows=31 width=20) (actual time=0.035..0.415 rows=30 loops=13533) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=211103 read=251562 dirtied=416 written=4707 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.019..0.019 rows=0 loops=405813) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1477433 read=148061 written=3277 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1466.388..1466.388 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=131686 read=14490 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=37.854..1337.195 rows=300963 loops=1) Buffers: shared hit=131686 read=14490 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.057..0.125 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=0.009..0.025 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.010..0.011 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=26.069..252.964 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=131684 read=14490 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=17.527..17.527 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=9 read=829 -> 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=24613) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73867 read=119 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 5.990 ms Execution time: 15818.449 ms (68 rows) COMMIT; COMMIT