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 ANODIZED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2212539.23..2212541.06 rows=731 width=38) (actual time=29876.495..29876.495 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=689875 read=317397 dirtied=1202 written=6207 -> HashAggregate (cost=2212491.67..2212504.46 rows=731 width=38) (actual time=29876.433..29876.435 rows=2 loops=1) Buffers: shared hit=689872 read=317397 dirtied=1202 written=6207 -> Nested Loop (cost=496689.24..2211990.01 rows=25083 width=38) (actual time=21973.499..29815.257 rows=24257 loops=1) Buffers: shared hit=689872 read=317397 dirtied=1202 written=6207 -> Nested Loop (cost=496689.24..2204836.34 rows=25083 width=16) (actual time=21973.433..29636.441 rows=24257 loops=1) Buffers: shared hit=641358 read=317397 dirtied=1202 written=6207 -> Hash Join (cost=496689.24..2197532.10 rows=25083 width=16) (actual time=21973.390..29270.352 rows=24257 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=568460 read=317397 dirtied=1202 written=6207 -> Nested Loop (cost=0.00..1698526.17 rows=413171 width=16) (actual time=0.340..6276.440 rows=403450 loops=1) Buffers: shared hit=225223 read=247772 dirtied=794 written=571 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47456.22 rows=13707 width=4) (actual time=0.250..155.149 rows=13452 loops=1) Index Cond: (p_type = 'ECONOMY ANODIZED STEEL'::text) Heap Fetches: 13452 Buffers: shared hit=6191 read=5412 written=6 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.14 rows=31 width=20) (actual time=0.042..0.440 rows=30 loops=13452) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=219032 read=242360 dirtied=794 written=565 -> Hash (cost=485253.89..485253.89 rows=914828 width=8) (actual time=21972.081..21972.081 rows=910261 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35558kB Buffers: shared hit=343234 read=69625 dirtied=408 written=5636 -> Hash Join (cost=135905.46..485253.89 rows=914828 width=8) (actual time=5370.163..21447.009 rows=910261 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=343234 read=69625 dirtied=408 written=5636 -> Bitmap Heap Scan on orders (cost=96874.84..419921.96 rows=4574141 width=12) (actual time=3194.174..8037.945 rows=4557174 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=233396 read=33525 dirtied=408 written=1169 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95731.31 rows=4574141 width=0) (actual time=3080.612..3080.612 rows=4579958 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=801 read=11685 written=1160 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2175.697..2175.697 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=109838 read=36100 written=4467 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=37.941..1979.036 rows=299436 loops=1) Buffers: shared hit=109838 read=36100 written=4467 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.028..0.099 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=0.005..0.029 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 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=0.010..0.011 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=33.605..374.693 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=109836 read=36100 written=4467 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.460..23.460 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=827 written=83 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=24257) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72898 -> 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=24257) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48514 Total runtime: 29890.244 ms (64 rows) COMMIT; COMMIT