BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1724156.26..1724158.09 rows=732 width=38) (actual time=11686.098..11686.099 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=1776028 read=223117 dirtied=1443 written=387 -> HashAggregate (cost=1724108.62..1724121.43 rows=732 width=38) (actual time=11686.011..11686.013 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1776025 read=223117 dirtied=1443 written=387 -> Hash Join (cost=39444.63..1723620.58 rows=24402 width=38) (actual time=1269.336..11638.998 rows=23990 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1776025 read=223117 dirtied=1443 written=387 -> Nested Loop (cost=39443.07..1723161.48 rows=24402 width=16) (actual time=1269.252..11593.420 rows=23990 loops=1) Buffers: shared hit=1776021 read=223117 dirtied=1443 written=387 -> Hash Join (cost=39442.78..1715287.88 rows=24402 width=16) (actual time=1269.226..11355.914 rows=23990 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1703935 read=223117 dirtied=1443 written=387 -> Nested Loop (cost=412.09..1675555.63 rows=122011 width=20) (actual time=10.700..10009.005 rows=120553 loops=1) Buffers: shared hit=1567844 read=213053 dirtied=1443 written=380 -> Nested Loop (cost=411.66..1479064.83 rows=401281 width=16) (actual time=10.500..4968.695 rows=397561 loops=1) Buffers: shared hit=271947 read=194307 dirtied=1436 written=349 -> Bitmap Heap Scan on part (cost=411.09..28014.26 rows=13247 width=4) (actual time=10.413..185.216 rows=13249 loops=1) Recheck Cond: ((p_type)::text = 'PROMO ANODIZED BRASS'::text) Heap Blocks: exact=11325 Buffers: shared hit=3095 read=8313 written=13 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.78 rows=13247 width=0) (actual time=7.388..7.388 rows=13249 loops=1) Index Cond: ((p_type)::text = 'PROMO ANODIZED BRASS'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.23 rows=31 width=20) (actual time=0.033..0.348 rows=30 loops=13249) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=268852 read=185994 dirtied=1436 written=336 -> 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=397561) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1295897 read=18746 dirtied=7 written=31 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1254.495..1254.495 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=136091 read=10064 written=7 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=31.671..1125.738 rows=299838 loops=1) Buffers: shared hit=136091 read=10064 written=7 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.073..0.108 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..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.025..0.025 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..0.019 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::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=27.497..207.159 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=136089 read=10064 written=7 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=18.469..18.469 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=23990) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72086 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.033..0.033 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..0.011 rows=25 loops=1) Buffers: shared hit=1 Planning time: 12.952 ms Execution time: 11687.152 ms (66 rows) COMMIT; COMMIT