BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED STATES' 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 = 'ECONOMY PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2206846.66..2206848.48 rows=728 width=38) (actual time=43921.095..43921.096 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=692658 read=318930 dirtied=3585 -> HashAggregate (cost=2206799.31..2206812.05 rows=728 width=38) (actual time=43921.032..43921.033 rows=2 loops=1) Buffers: shared hit=692655 read=318930 dirtied=3585 -> Nested Loop (cost=502956.76..2206312.77 rows=24327 width=38) (actual time=35112.506..43849.639 rows=24290 loops=1) Buffers: shared hit=692655 read=318930 dirtied=3585 -> Nested Loop (cost=502956.76..2199374.71 rows=24327 width=16) (actual time=35112.457..43666.457 rows=24290 loops=1) Buffers: shared hit=644075 read=318930 dirtied=3585 -> Hash Join (cost=502956.76..2192288.32 rows=24335 width=16) (actual time=35112.432..43272.758 rows=24290 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=571068 read=318930 dirtied=3585 -> Nested Loop (cost=0.00..1687074.90 rows=402661 width=16) (actual time=0.354..6885.113 rows=401687 loops=1) Buffers: shared hit=284819 read=188956 dirtied=3585 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46027.69 rows=13227 width=4) (actual time=0.232..296.591 rows=13362 loops=1) Index Cond: (p_type = 'ECONOMY PLATED NICKEL'::text) Heap Fetches: 13362 Buffers: shared hit=248 read=11250 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..123.75 rows=32 width=20) (actual time=0.050..0.477 rows=30 loops=13362) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=284571 read=177706 dirtied=3585 -> Hash (cost=491455.41..491455.41 rows=920108 width=8) (actual time=35110.767..35110.767 rows=911232 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35595kB Buffers: shared hit=286246 read=129974 -> Hash Join (cost=138928.17..491455.41 rows=920108 width=8) (actual time=8157.344..34136.156 rows=911232 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=286246 read=129974 -> Bitmap Heap Scan on orders (cost=99897.55..425971.68 rows=4600542 width=12) (actual time=4701.513..16385.906 rows=4561762 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=141717 read=128565 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98747.42 rows=4600542 width=0) (actual time=4561.459..4561.459 rows=4625776 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=11 read=13205 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=3455.531..3455.531 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=144529 read=1409 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=61.679..3232.603 rows=299436 loops=1) Buffers: shared hit=144529 read=1409 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.038..0.096 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..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.013..0.015 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=48.212..624.713 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=144527 read=1409 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=37.976..37.976 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=0.014..0.014 rows=1 loops=24290) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73007 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.005 rows=1 loops=24290) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48580 Total runtime: 43944.546 ms (64 rows) COMMIT; COMMIT