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 = 'STANDARD BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1763830.63..1763832.47 rows=733 width=38) (actual time=12377.988..12377.989 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=1636028 read=378999 dirtied=401 written=7021 -> HashAggregate (cost=1763782.92..1763795.75 rows=733 width=38) (actual time=12377.930..12377.932 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1636025 read=378999 dirtied=401 written=7021 -> Hash Join (cost=39455.73..1763284.20 rows=24936 width=38) (actual time=1034.374..12332.259 rows=24478 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1636025 read=378999 dirtied=401 written=7021 -> Nested Loop (cost=39454.17..1762815.09 rows=24936 width=16) (actual time=1034.299..12289.404 rows=24478 loops=1) Buffers: shared hit=1636021 read=378999 dirtied=401 written=7021 -> Hash Join (cost=39453.88..1754769.15 rows=24936 width=16) (actual time=1034.265..12097.900 rows=24478 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1562709 read=378727 dirtied=401 written=7021 -> Nested Loop (cost=423.19..1715021.55 rows=124682 width=20) (actual time=6.835..10929.497 rows=121672 loops=1) Buffers: shared hit=1435593 read=359606 dirtied=401 written=7021 -> Nested Loop (cost=422.76..1514407.23 rows=409723 width=16) (actual time=6.710..6072.888 rows=401139 loops=1) Buffers: shared hit=180055 read=288607 dirtied=401 written=6042 -> Bitmap Heap Scan on part (cost=422.19..28502.14 rows=13647 width=4) (actual time=6.632..211.048 rows=13366 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Heap Blocks: exact=11369 Buffers: shared hit=908 read=10545 written=334 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.78 rows=13647 width=0) (actual time=4.542..4.542 rows=13366 loops=1) Index Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.57 rows=31 width=20) (actual time=0.035..0.426 rows=30 loops=13366) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=179147 read=278062 dirtied=401 written=5708 -> 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=401139) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1255538 read=70999 written=979 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1023.172..1023.172 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=127116 read=19121 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=19.908..894.995 rows=300270 loops=1) Buffers: shared hit=127116 read=19121 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.035..0.082 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..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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 = '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=20.397..166.936 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=127114 read=19121 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.320..13.320 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=9 read=826 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24478) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73312 read=272 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.024..0.024 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=0.006..0.011 rows=25 loops=1) Buffers: shared hit=1 Planning time: 5.721 ms Execution time: 12379.094 ms (66 rows) COMMIT; COMMIT