BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'VIETNAM' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1751349.17..1751351.00 rows=729 width=38) (actual time=11155.443..11155.444 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=1757987 read=243679 dirtied=110 written=24 -> HashAggregate (cost=1751301.75..1751314.51 rows=729 width=38) (actual time=11155.381..11155.383 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1757984 read=243679 dirtied=110 written=24 -> Hash Join (cost=39454.95..1750808.43 rows=24666 width=38) (actual time=1150.691..11115.271 rows=24279 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1757984 read=243679 dirtied=110 written=24 -> Nested Loop (cost=39453.39..1750344.38 rows=24666 width=16) (actual time=1150.626..11080.084 rows=24279 loops=1) Buffers: shared hit=1757980 read=243679 dirtied=110 written=24 -> Hash Join (cost=39453.10..1742385.58 rows=24666 width=16) (actual time=1150.604..10858.273 rows=24279 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1685000 read=243679 dirtied=110 written=24 -> Nested Loop (cost=422.41..1702645.74 rows=123330 width=20) (actual time=7.563..9625.189 rows=120950 loops=1) Buffers: shared hit=1571852 read=210590 dirtied=110 written=24 -> Nested Loop (cost=421.98..1503197.76 rows=407334 width=16) (actual time=7.453..4651.134 rows=398130 loops=1) Buffers: shared hit=293078 read=172523 written=22 -> Bitmap Heap Scan on part (cost=417.26..28355.92 rows=13527 width=4) (actual time=7.344..161.653 rows=13247 loops=1) Recheck Cond: ((p_type)::text = 'PROMO PLATED NICKEL'::text) Heap Blocks: exact=11322 Buffers: shared hit=3240 read=8151 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.88 rows=13527 width=0) (actual time=5.009..5.009 rows=13247 loops=1) Index Cond: ((p_type)::text = 'PROMO PLATED NICKEL'::text) Buffers: shared read=69 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.043..0.328 rows=30 loops=13247) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=399244 Buffers: shared hit=289838 read=164372 written=22 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.028..0.028 rows=30 loops=13247) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39577 read=15389 written=1 -> 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=398130) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1278774 read=38067 dirtied=110 written=2 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1139.044..1139.044 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=113148 read=33089 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.579..1033.162 rows=300270 loops=1) Buffers: shared hit=113148 read=33089 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.057..0.087 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=0.008..0.019 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=0.016..0.017 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=19.293..195.285 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=113146 read=33089 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.648..12.648 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24279) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72980 -> 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=0.005..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 9.412 ms Execution time: 11156.321 ms (70 rows) COMMIT; COMMIT