BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 BRUSHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1703454.44..1703456.26 rows=729 width=38) (actual time=10043.634..10043.635 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=1804278 read=219791 dirtied=1729 written=5311 -> HashAggregate (cost=1703407.02..1703419.78 rows=729 width=38) (actual time=10043.574..10043.575 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1804275 read=219791 dirtied=1729 written=5311 -> Hash Join (cost=39439.18..1702928.04 rows=23949 width=38) (actual time=792.558..10005.550 rows=24352 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1804275 read=219791 dirtied=1729 written=5311 -> Nested Loop (cost=39437.62..1702477.43 rows=23949 width=16) (actual time=792.499..9971.213 rows=24352 loops=1) Buffers: shared hit=1804271 read=219791 dirtied=1729 written=5311 -> Hash Join (cost=39437.33..1694750.00 rows=23949 width=16) (actual time=792.479..9764.322 rows=24352 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1731060 read=219791 dirtied=1729 written=5311 -> Nested Loop (cost=406.64..1655030.78 rows=119745 width=20) (actual time=7.343..8901.386 rows=122491 loops=1) Buffers: shared hit=1585762 read=218934 dirtied=1729 written=5261 -> Nested Loop (cost=406.21..1461380.01 rows=395494 width=16) (actual time=7.289..4317.722 rows=402593 loops=1) Buffers: shared hit=283329 read=189657 dirtied=1729 written=4541 -> Bitmap Heap Scan on part (cost=405.64..27782.65 rows=13060 width=4) (actual time=7.214..180.368 rows=13430 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BRUSHED NICKEL'::text) Heap Blocks: exact=11462 Buffers: shared hit=1598 read=9948 written=239 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..402.38 rows=13060 width=0) (actual time=4.977..4.977 rows=13430 loops=1) Index Cond: ((p_type)::text = 'PROMO BRUSHED NICKEL'::text) Buffers: shared read=84 written=8 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.46 rows=31 width=20) (actual time=0.029..0.298 rows=30 loops=13430) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=281731 read=179709 dirtied=1729 written=4302 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=402593) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1302433 read=29277 written=720 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=782.699..782.699 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=145298 read=857 written=50 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.491..697.473 rows=299838 loops=1) Buffers: shared hit=145298 read=857 written=50 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.040..0.070 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..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.019..0.019 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..0.014 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=18.719..129.277 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=145296 read=857 written=50 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.368..12.368 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=828 written=49 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24352) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73211 -> 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: 7.001 ms Execution time: 10044.417 ms (66 rows) COMMIT; COMMIT