BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'PERU' 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 = 'AMERICA' 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=2154570.62..2154572.45 rows=731 width=38) (actual time=30678.375..30678.376 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=754604 read=246856 dirtied=2555 written=47148 -> HashAggregate (cost=2154523.06..2154535.85 rows=731 width=38) (actual time=30678.297..30678.299 rows=2 loops=1) Buffers: shared hit=754601 read=246856 dirtied=2555 written=47148 -> Nested Loop (cost=502176.45..2154040.22 rows=24142 width=38) (actual time=22259.080..30614.903 rows=23956 loops=1) Buffers: shared hit=754601 read=246856 dirtied=2555 written=47148 -> Nested Loop (cost=502176.45..2147154.92 rows=24142 width=16) (actual time=22259.011..30450.685 rows=23956 loops=1) Buffers: shared hit=706689 read=246856 dirtied=2555 written=47148 -> Hash Join (cost=502176.45..2140124.72 rows=24142 width=16) (actual time=22258.963..30116.127 rows=23956 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=634660 read=246856 dirtied=2555 written=47148 -> Nested Loop (cost=0.00..1635719.59 rows=397454 width=16) (actual time=2.553..6696.556 rows=395647 loops=1) Buffers: shared hit=243136 read=223220 dirtied=2525 written=45984 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45665.38 rows=13107 width=4) (actual time=1.675..280.638 rows=13188 loops=1) Index Cond: (p_type = 'PROMO BURNISHED STEEL'::text) Heap Fetches: 13188 Buffers: shared read=11396 written=2289 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.00 rows=31 width=20) (actual time=0.045..0.471 rows=30 loops=13188) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=243136 read=211824 dirtied=2525 written=43695 -> Hash (cost=490662.28..490662.28 rows=921133 width=8) (actual time=22254.662..22254.662 rows=910317 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35560kB Buffers: shared hit=391521 read=23636 dirtied=30 written=1164 -> Hash Join (cost=139040.70..490662.28 rows=921133 width=8) (actual time=4819.564..21241.721 rows=910317 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=391521 read=23636 dirtied=30 written=1164 -> Bitmap Heap Scan on orders (cost=100010.08..425149.08 rows=4605667 width=12) (actual time=3249.047..7930.745 rows=4557203 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=246435 read=22784 dirtied=30 written=1164 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98858.66 rows=4605667 width=0) (actual time=3138.146..3138.146 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1570.217..1570.217 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=145086 read=852 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=37.585..1394.569 rows=299436 loops=1) Buffers: shared hit=145086 read=852 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.057..0.118 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..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.029..0.029 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=0.023..0.024 rows=1 loops=1) Filter: (r_name = 'AMERICA'::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=31.185..260.374 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145084 read=852 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.704..21.704 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=826 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=23956) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72029 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=23956) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=47912 Total runtime: 30694.000 ms (64 rows) COMMIT; COMMIT