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 = 'PROMO ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1727025.97..1727027.80 rows=733 width=38) (actual time=8407.248..8407.249 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=1765756 read=240062 dirtied=137 -> HashAggregate (cost=1726978.26..1726991.09 rows=733 width=38) (actual time=8407.194..8407.195 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1765753 read=240062 dirtied=137 -> Hash Join (cost=39449.45..1726489.54 rows=24436 width=38) (actual time=929.781..8369.156 rows=24359 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1765753 read=240062 dirtied=137 -> Nested Loop (cost=39447.89..1726029.80 rows=24436 width=16) (actual time=929.712..8337.478 rows=24359 loops=1) Buffers: shared hit=1765749 read=240062 dirtied=137 -> Hash Join (cost=39447.60..1718145.21 rows=24436 width=16) (actual time=929.674..8162.957 rows=24359 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1692515 read=240062 dirtied=137 -> Nested Loop (cost=416.91..1678412.00 rows=122178 width=20) (actual time=6.876..7161.880 rows=121292 loops=1) Buffers: shared hit=1582445 read=203956 dirtied=137 -> Nested Loop (cost=416.48..1481824.03 rows=401493 width=16) (actual time=6.472..3669.983 rows=398959 loops=1) Buffers: shared hit=271418 read=195350 dirtied=88 -> Bitmap Heap Scan on part (cost=411.76..28119.12 rows=13333 width=4) (actual time=6.393..129.188 rows=13278 loops=1) Recheck Cond: ((p_type)::text = 'PROMO ANODIZED NICKEL'::text) Heap Blocks: exact=11388 Buffers: shared hit=3022 read=8449 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.43 rows=13333 width=0) (actual time=4.297..4.297 rows=13278 loops=1) Index Cond: ((p_type)::text = 'PROMO ANODIZED NICKEL'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.035..0.256 rows=30 loops=13278) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=400198 Buffers: shared hit=268396 read=186901 dirtied=88 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.023..0.023 rows=30 loops=13278) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39340 read=15759 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.008..0.008 rows=0 loops=398959) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1311027 read=8606 dirtied=49 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=919.422..919.422 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=110070 read=36106 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=18.115..822.524 rows=300963 loops=1) Buffers: shared hit=110070 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.037..0.075 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..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.018..0.018 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=0.012..0.012 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=16.776..153.933 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=110068 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.963..10.963 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..0.006 rows=1 loops=24359) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73234 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.026..0.026 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..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.512 ms Execution time: 8408.033 ms (70 rows) COMMIT; COMMIT