BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDIA' 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 BURNISHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1688360.05..1688361.87 rows=727 width=38) (actual time=10348.624..10348.625 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=1715166 read=276912 dirtied=1280 written=38 -> HashAggregate (cost=1688312.78..1688325.50 rows=727 width=38) (actual time=10348.567..10348.569 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1715163 read=276912 dirtied=1280 written=38 -> Hash Join (cost=39434.20..1687840.70 rows=23604 width=38) (actual time=1275.992..10307.949 rows=24010 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1715163 read=276912 dirtied=1280 written=38 -> Nested Loop (cost=39432.64..1687396.56 rows=23604 width=16) (actual time=1275.920..10270.451 rows=24010 loops=1) Buffers: shared hit=1715159 read=276912 dirtied=1280 written=38 -> Hash Join (cost=39432.34..1679780.43 rows=23604 width=16) (actual time=1275.883..10071.158 rows=24010 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1642989 read=276912 dirtied=1280 written=38 -> Nested Loop (cost=401.66..1640071.13 rows=118020 width=20) (actual time=7.414..8686.240 rows=120427 loops=1) Buffers: shared hit=1532676 read=240988 dirtied=1280 written=38 -> Nested Loop (cost=401.22..1448809.25 rows=390609 width=16) (actual time=7.009..4256.189 rows=395902 loops=1) Buffers: shared hit=263030 read=201093 dirtied=1214 written=30 -> Bitmap Heap Scan on part (cost=400.66..27622.47 rows=12933 width=4) (actual time=6.945..141.141 rows=13188 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BURNISHED STEEL'::text) Heap Blocks: exact=11313 Buffers: shared hit=4323 read=7072 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..397.43 rows=12933 width=0) (actual time=4.760..4.760 rows=13188 loops=1) Index Cond: ((p_type)::text = 'PROMO BURNISHED STEEL'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.58 rows=31 width=20) (actual time=0.028..0.301 rows=30 loops=13188) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=258707 read=194021 dirtied=1214 written=30 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.011 rows=0 loops=395902) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1269646 read=39895 dirtied=66 written=8 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1265.829..1265.829 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=110313 read=35924 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.728..1134.830 rows=300270 loops=1) Buffers: shared hit=110313 read=35924 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.044..0.111 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=0.007..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.020..0.020 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=0.013..0.014 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=26.958..215.514 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=110311 read=35924 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=16.227..16.227 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=0.007..0.007 rows=1 loops=24010) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72170 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.543 ms Execution time: 10349.634 ms (66 rows) COMMIT; COMMIT