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 PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2210027.56..2210029.39 rows=731 width=38) (actual time=27247.433..27247.434 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=821886 read=188143 dirtied=652 written=9863 -> HashAggregate (cost=2209980.00..2209992.79 rows=731 width=38) (actual time=27247.346..27247.349 rows=2 loops=1) Buffers: shared hit=821883 read=188143 dirtied=652 written=9863 -> Nested Loop (cost=495182.41..2209480.34 rows=24983 width=38) (actual time=20508.909..27184.002 rows=24613 loops=1) Buffers: shared hit=821883 read=188143 dirtied=652 written=9863 -> Nested Loop (cost=495182.41..2202355.18 rows=24983 width=16) (actual time=20508.842..27011.767 rows=24613 loops=1) Buffers: shared hit=772657 read=188143 dirtied=652 written=9863 -> Hash Join (cost=495182.41..2195080.05 rows=24983 width=16) (actual time=20508.803..26659.319 rows=24613 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=698671 read=188143 dirtied=652 written=9863 -> Nested Loop (cost=0.00..1697590.18 rows=411525 width=16) (actual time=0.366..4870.966 rows=405813 loops=1) Buffers: shared hit=363609 read=111047 dirtied=652 written=6972 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47456.22 rows=13707 width=4) (actual time=0.282..163.715 rows=13533 loops=1) Index Cond: (p_type = 'STANDARD PLATED BRASS'::text) Heap Fetches: 13533 Buffers: shared hit=6928 read=4735 written=535 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.08 rows=31 width=20) (actual time=0.040..0.332 rows=30 loops=13533) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=356681 read=106312 dirtied=652 written=6437 -> Hash (cost=483788.09..483788.09 rows=911546 width=8) (actual time=20506.890..20506.890 rows=913072 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35667kB Buffers: shared hit=335059 read=77096 written=2891 -> Hash Join (cost=135693.23..483788.09 rows=911546 width=8) (actual time=4225.309..19721.772 rows=913072 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=335059 read=77096 written=2891 -> Bitmap Heap Scan on orders (cost=96662.61..418550.53 rows=4557728 width=12) (actual time=2284.290..6903.486 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=203498 read=62480 written=2891 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95523.18 rows=4557728 width=0) (actual time=2161.277..2161.277 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=6932 read=5524 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1940.727..1940.727 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=131561 read=14616 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=53.605..1750.844 rows=300963 loops=1) Buffers: shared hit=131561 read=14616 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.038..0.102 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..0.018 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=0.012..0.013 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=41.585..329.946 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=131559 read=14616 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.756..26.756 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=10 read=829 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=24613) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73986 -> 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=24613) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49226 Total runtime: 27266.397 ms (64 rows) COMMIT; COMMIT