BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' 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 TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2135938.67..2135940.49 rows=728 width=38) (actual time=51035.063..51035.063 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=732222 read=279501 dirtied=2661 written=15961 -> HashAggregate (cost=2135891.33..2135904.07 rows=728 width=38) (actual time=51034.945..51034.947 rows=2 loops=1) Buffers: shared hit=732219 read=279501 dirtied=2661 written=15961 -> Nested Loop (cost=500669.40..2135417.23 rows=23705 width=38) (actual time=29877.991..50922.344 rows=24599 loops=1) Buffers: shared hit=732219 read=279501 dirtied=2661 written=15961 -> Nested Loop (cost=500669.40..2128656.56 rows=23705 width=16) (actual time=29877.926..50494.690 rows=24599 loops=1) Buffers: shared hit=683021 read=279501 dirtied=2661 written=15961 -> Hash Join (cost=500669.40..2121751.28 rows=23713 width=16) (actual time=29877.877..49426.241 rows=24599 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=609070 read=279501 dirtied=2661 written=15961 -> Nested Loop (cost=0.00..1618882.89 rows=392374 width=16) (actual time=0.565..18248.042 rows=402671 loops=1) Buffers: shared hit=229750 read=243692 dirtied=2661 written=15954 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45202.90 rows=12953 width=4) (actual time=0.484..438.748 rows=13387 loops=1) Index Cond: (p_type = 'STANDARD ANODIZED TIN'::text) Heap Fetches: 13387 Buffers: shared hit=6335 read=5231 written=330 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.18 rows=31 width=20) (actual time=0.133..1.311 rows=30 loops=13387) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=223415 read=238461 dirtied=2661 written=15624 -> Hash (cost=489224.63..489224.63 rows=915581 width=8) (actual time=29876.189..29876.189 rows=913857 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35698kB Buffers: shared hit=379317 read=35809 written=7 -> Hash Join (cost=138432.12..489224.63 rows=915581 width=8) (actual time=7241.965..29250.926 rows=913857 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=379317 read=35809 written=7 -> Bitmap Heap Scan on orders (cost=99401.50..423871.06 rows=4577904 width=12) (actual time=4308.099..12370.132 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=240636 read=28313 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98257.03 rows=4577904 width=0) (actual time=4176.950..4176.950 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13148 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2933.562..2933.562 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=138681 read=7496 written=7 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=55.718..2713.444 rows=300963 loops=1) Buffers: shared hit=138681 read=7496 written=7 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.058..0.134 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=0.010..0.028 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.019..0.020 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=41.805..520.334 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=138679 read=7496 written=7 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.036..30.036 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 written=6 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.040..0.040 rows=1 loops=24599) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73951 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.012..0.013 rows=1 loops=24599) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49198 Total runtime: 51046.825 ms (64 rows) COMMIT; COMMIT