BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'GERMANY' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD ANODIZED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1727815.30..1727817.12 rows=729 width=38) (actual time=11059.216..11059.216 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=1761710 read=234347 dirtied=1205 written=6494 -> HashAggregate (cost=1727767.88..1727780.64 rows=729 width=38) (actual time=11059.151..11059.153 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1761707 read=234347 dirtied=1205 written=6494 -> Hash Join (cost=39444.94..1727281.18 rows=24335 width=38) (actual time=1328.106..11018.812 rows=24159 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1761707 read=234347 dirtied=1205 written=6494 -> Nested Loop (cost=39443.38..1726823.34 rows=24335 width=16) (actual time=1328.042..10979.727 rows=24159 loops=1) Buffers: shared hit=1761703 read=234347 dirtied=1205 written=6494 -> Hash Join (cost=39443.09..1718971.35 rows=24335 width=16) (actual time=1328.021..10759.312 rows=24159 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1689101 read=234347 dirtied=1205 written=6494 -> Nested Loop (cost=412.40..1679241.04 rows=121673 width=20) (actual time=7.542..9330.780 rows=120443 loops=1) Buffers: shared hit=1579202 read=198070 dirtied=1205 written=3709 -> Nested Loop (cost=411.97..1482472.13 rows=401860 width=16) (actual time=7.393..4204.074 rows=396606 loops=1) Buffers: shared hit=312238 read=153401 dirtied=1205 written=2912 -> Bitmap Heap Scan on part (cost=411.40..28063.46 rows=13287 width=4) (actual time=7.311..176.551 rows=13234 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD ANODIZED STEEL'::text) Heap Blocks: exact=11271 Buffers: shared hit=2401 read=8952 written=209 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.08 rows=13287 width=0) (actual time=4.995..4.995 rows=13234 loops=1) Index Cond: ((p_type)::text = 'STANDARD ANODIZED STEEL'::text) Buffers: shared read=82 written=5 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.15 rows=31 width=20) (actual time=0.028..0.294 rows=30 loops=13234) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=309837 read=144449 dirtied=1205 written=2703 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=396606) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1266964 read=44669 written=797 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1315.210..1315.210 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=109899 read=36277 written=2785 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=34.560..1192.509 rows=300963 loops=1) Buffers: shared hit=109899 read=36277 written=2785 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.056..0.124 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..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.016..0.017 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=23.354..226.821 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=109897 read=36277 written=2785 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=16.196..16.196 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 written=47 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24159) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72602 -> 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..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.824 ms Execution time: 11060.326 ms (66 rows) COMMIT; COMMIT