BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ROMANIA' 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 = 'ECONOMY ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2175568.40..2175570.23 rows=731 width=38) (actual time=14341.442..14341.443 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=821844 read=182827 -> HashAggregate (cost=2175520.84..2175533.63 rows=731 width=38) (actual time=14341.388..14341.390 rows=2 loops=1) Buffers: shared hit=821841 read=182827 -> Nested Loop (cost=495182.41..2175032.84 rows=24400 width=38) (actual time=10371.618..14311.603 rows=24505 loops=1) Buffers: shared hit=821841 read=182827 -> Nested Loop (cost=495182.41..2168073.96 rows=24400 width=16) (actual time=10371.565..14251.216 rows=24505 loops=1) Buffers: shared hit=772831 read=182827 -> Hash Join (cost=495182.41..2160968.59 rows=24400 width=16) (actual time=10371.529..14074.146 rows=24505 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=701648 read=180378 -> Nested Loop (cost=0.00..1663532.59 rows=401918 width=16) (actual time=0.360..3015.484 rows=402527 loops=1) Buffers: shared hit=313358 read=156510 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46506.62 rows=13387 width=4) (actual time=0.289..126.173 rows=13417 loops=1) Index Cond: (p_type = 'ECONOMY ANODIZED TIN'::text) Heap Fetches: 13417 Buffers: shared hit=1 read=11590 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.48 rows=31 width=20) (actual time=0.022..0.207 rows=30 loops=13417) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=313357 read=144920 -> Hash (cost=483788.09..483788.09 rows=911546 width=8) (actual time=10369.564..10369.564 rows=913948 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35702kB Buffers: shared hit=388287 read=23868 -> Hash Join (cost=135693.23..483788.09 rows=911546 width=8) (actual time=1868.746..10081.017 rows=913948 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=388287 read=23868 -> Bitmap Heap Scan on orders (cost=96662.61..418550.53 rows=4557728 width=12) (actual time=1244.164..3606.725 rows=4561961 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=242943 read=23035 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95523.18 rows=4557728 width=0) (actual time=1157.417..1157.417 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=624.283..624.283 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=145344 read=833 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=35.772..549.918 rows=300963 loops=1) Buffers: shared hit=145344 read=833 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.030..0.091 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=0.007..0.026 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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=0.007..0.008 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=20.690..99.332 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145342 read=833 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.563..14.563 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=0.006..0.006 rows=1 loops=24505) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71183 read=2449 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.001..0.001 rows=1 loops=24505) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49010 Total runtime: 14347.972 ms (64 rows) COMMIT; COMMIT