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 BURNISHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2140347.73..2140349.55 rows=728 width=38) (actual time=47770.218..47770.218 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=707201 read=299541 dirtied=2425 written=12815 -> HashAggregate (cost=2140300.38..2140313.12 rows=728 width=38) (actual time=47770.151..47770.154 rows=2 loops=1) Buffers: shared hit=707198 read=299541 dirtied=2425 written=12815 -> Nested Loop (cost=501134.04..2139824.56 rows=23791 width=38) (actual time=29725.409..47673.830 rows=24353 loops=1) Buffers: shared hit=707198 read=299541 dirtied=2425 written=12815 -> Nested Loop (cost=501134.04..2133039.37 rows=23791 width=16) (actual time=29725.338..47299.626 rows=24353 loops=1) Buffers: shared hit=658492 read=299541 dirtied=2425 written=12815 -> Hash Join (cost=501134.04..2126109.05 rows=23799 width=16) (actual time=29725.303..46376.918 rows=24353 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=585308 read=299541 dirtied=2425 written=12815 -> Nested Loop (cost=0.00..1622768.03 rows=393797 width=16) (actual time=1.224..15358.408 rows=398813 loops=1) Buffers: shared hit=236595 read=232855 dirtied=2425 written=12810 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45303.49 rows=12987 width=4) (actual time=1.135..345.391 rows=13296 loops=1) Index Cond: (p_type = 'ECONOMY BURNISHED STEEL'::text) Heap Fetches: 13296 Buffers: shared hit=7417 read=4044 written=335 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.15 rows=31 width=20) (actual time=0.117..1.111 rows=30 loops=13296) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=229178 read=228811 dirtied=2425 written=12475 -> Hash (cost=489677.97..489677.97 rows=916486 width=8) (actual time=29722.432..29722.432 rows=913882 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35699kB Buffers: shared hit=348710 read=66686 written=5 -> Hash Join (cost=138538.53..489677.97 rows=916486 width=8) (actual time=7580.682..27987.167 rows=913882 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=348710 read=66686 written=5 -> Bitmap Heap Scan on orders (cost=99507.91..424298.37 rows=4582431 width=12) (actual time=3786.360..11727.763 rows=4561778 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=238639 read=30580 written=5 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98362.30 rows=4582431 width=0) (actual time=3604.320..3604.320 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=3794.065..3794.065 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=110071 read=36106 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=53.631..3576.858 rows=300963 loops=1) Buffers: shared hit=110071 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.039..0.103 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=0.008..0.020 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=0.013..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=44.237..695.123 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110069 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=32.964..32.964 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=0.035..0.035 rows=1 loops=24353) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73184 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.011..0.012 rows=1 loops=24353) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48706 Total runtime: 47784.334 ms (64 rows) COMMIT; COMMIT