BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'RUSSIA' 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 BRUSHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2185486.46..2185488.28 rows=728 width=38) (actual time=30566.248..30566.248 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=724437 read=288760 dirtied=2932 written=16085 -> HashAggregate (cost=2185439.11..2185451.85 rows=728 width=38) (actual time=30566.166..30566.168 rows=2 loops=1) Buffers: shared hit=724434 read=288760 dirtied=2932 written=16085 -> Nested Loop (cost=502047.42..2184960.13 rows=23949 width=38) (actual time=20406.508..30493.980 rows=24575 loops=1) Buffers: shared hit=724434 read=288760 dirtied=2932 written=16085 -> Nested Loop (cost=502047.42..2178129.88 rows=23949 width=16) (actual time=20406.455..30309.458 rows=24575 loops=1) Buffers: shared hit=675284 read=288760 dirtied=2932 written=16085 -> Hash Join (cost=502047.42..2171153.85 rows=23956 width=16) (actual time=20406.415..29912.423 rows=24575 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=601427 read=288760 dirtied=2932 written=16085 -> Nested Loop (cost=0.00..1666884.86 rows=396403 width=16) (actual time=0.420..8164.975 rows=402370 loops=1) Buffers: shared hit=200160 read=274096 dirtied=2932 written=16083 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45484.54 rows=13047 width=4) (actual time=0.318..201.694 rows=13421 loops=1) Index Cond: (p_type = 'STANDARD BRUSHED TIN'::text) Heap Fetches: 13421 Buffers: shared hit=4975 read=6564 written=706 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..123.95 rows=32 width=20) (actual time=0.050..0.576 rows=30 loops=13421) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=195185 read=267532 dirtied=2932 written=15377 -> Hash (cost=490568.71..490568.71 rows=918297 width=8) (actual time=20404.892..20404.892 rows=913872 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35699kB Buffers: shared hit=401264 read=14664 written=2 -> Hash Join (cost=138735.36..490568.71 rows=918297 width=8) (actual time=3765.656..19131.788 rows=913872 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=401264 read=14664 written=2 -> Bitmap Heap Scan on orders (cost=99704.73..425137.04 rows=4591487 width=12) (actual time=2481.447..7027.139 rows=4561702 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=255922 read=13829 written=2 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98556.86 rows=4591487 width=0) (actual time=2381.509..2381.509 rows=4616605 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13191 written=2 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1283.630..1283.630 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=145342 read=835 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=33.599..1112.609 rows=300963 loops=1) Buffers: shared hit=145342 read=835 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.035..0.073 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=0.006..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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..0.014 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=31.659..203.518 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145340 read=835 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.909..21.909 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.013..0.014 rows=1 loops=24575) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73857 -> 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=24575) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49150 Total runtime: 30594.282 ms (64 rows) COMMIT; COMMIT