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 = 'LARGE PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2173714.75..2173716.58 rows=733 width=38) (actual time=37549.355..37549.355 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=694876 read=319611 dirtied=2972 written=17203 -> HashAggregate (cost=2173667.04..2173679.87 rows=733 width=38) (actual time=37549.253..37549.254 rows=2 loops=1) Buffers: shared hit=694873 read=319611 dirtied=2972 written=17203 -> Nested Loop (cost=503009.73..2173176.72 rows=24516 width=38) (actual time=25418.072..37472.151 rows=24603 loops=1) Buffers: shared hit=694873 read=319611 dirtied=2972 written=17203 -> Nested Loop (cost=503009.73..2166184.76 rows=24516 width=16) (actual time=25418.003..37161.362 rows=24603 loops=1) Buffers: shared hit=645667 read=319611 dirtied=2972 written=17203 -> Hash Join (cost=503009.73..2159045.66 rows=24516 width=16) (actual time=25417.960..36587.255 rows=24603 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=571735 read=319611 dirtied=2972 written=17203 -> Nested Loop (cost=0.00..1653776.43 rows=402868 width=16) (actual time=0.506..9768.991 rows=403641 loops=1) Buffers: shared hit=209184 read=266435 dirtied=2972 written=17188 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46164.32 rows=13273 width=4) (actual time=0.407..209.052 rows=13466 loops=1) Index Cond: (p_type = 'LARGE PLATED NICKEL'::text) Heap Fetches: 13466 Buffers: shared hit=6441 read=5131 written=191 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.81 rows=31 width=20) (actual time=0.066..0.693 rows=30 loops=13466) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=202743 read=261304 dirtied=2972 written=16997 -> Hash (cost=491463.00..491463.00 rows=923738 width=8) (actual time=25416.299..25416.299 rows=913268 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35675kB Buffers: shared hit=362548 read=53176 written=15 -> Hash Join (cost=139318.18..491463.00 rows=923738 width=8) (actual time=5617.011..24471.169 rows=913268 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=362548 read=53176 written=15 -> Bitmap Heap Scan on orders (cost=100287.56..425874.91 rows=4618690 width=12) (actual time=3480.951..9038.211 rows=4561761 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=223374 read=46112 written=15 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99132.89 rows=4618690 width=0) (actual time=3327.866..3327.866 rows=4612043 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=13177 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2135.763..2135.763 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=139174 read=7064 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=36.426..1649.288 rows=300270 loops=1) Buffers: shared hit=139174 read=7064 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.049..0.112 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..0.027 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.021..0.021 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.018..0.019 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=35.234..311.065 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=139172 read=7064 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=24.021..24.021 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.020..0.021 rows=1 loops=24603) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73932 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.009..0.009 rows=1 loops=24603) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49206 Total runtime: 37569.963 ms (64 rows) COMMIT; COMMIT