BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1711883.23..1711885.05 rows=729 width=38) (actual time=11420.157..11420.157 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=2081986 read=241374 dirtied=1574 written=9919 -> HashAggregate (cost=1711835.81..1711848.57 rows=729 width=38) (actual time=11420.117..11420.118 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2081983 read=241374 dirtied=1574 written=9919 -> Hash Join (cost=38739.42..1711354.89 rows=24046 width=38) (actual time=2301.536..11379.766 rows=24487 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2081983 read=241374 dirtied=1574 written=9919 -> Nested Loop (cost=38737.86..1710902.46 rows=24046 width=16) (actual time=2301.463..11340.843 rows=24487 loops=1) Buffers: shared hit=2081979 read=241374 dirtied=1574 written=9919 -> Hash Join (cost=38737.57..1703130.81 rows=24086 width=16) (actual time=2301.446..11195.985 rows=24487 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=2008368 read=241374 dirtied=1574 written=9919 -> Nested Loop (cost=407.42..1664108.20 rows=120429 width=20) (actual time=9.232..8827.811 rows=122188 loops=1) Buffers: shared hit=1867247 read=206097 dirtied=1574 written=9897 -> Nested Loop (cost=406.98..1469422.52 rows=397607 width=16) (actual time=8.236..4906.814 rows=400480 loops=1) Buffers: shared hit=288892 read=180333 dirtied=1574 written=8695 -> Bitmap Heap Scan on part (cost=406.42..27904.95 rows=13160 width=4) (actual time=8.195..131.537 rows=13332 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BURNISHED NICKEL'::text) Heap Blocks: exact=11385 Buffers: shared hit=4534 read=6934 written=123 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..403.13 rows=13160 width=0) (actual time=5.568..5.568 rows=13332 loops=1) Index Cond: ((p_type)::text = 'SMALL BURNISHED NICKEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem (cost=0.56..109.23 rows=31 width=20) (actual time=0.026..0.349 rows=30 loops=13332) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=284358 read=173399 dirtied=1574 written=8572 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.009..0.009 rows=0 loops=400480) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1578355 read=25764 written=1202 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2288.650..2288.650 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=141121 read=35277 written=22 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=4.045..2187.618 rows=299838 loops=1) Buffers: shared hit=141121 read=35277 written=22 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.037..0.068 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..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.016..0.016 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.011..0.011 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=3.699..427.036 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1440032 Heap Blocks: lossy=176390 Buffers: shared hit=141119 read=35277 written=22 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.663..3.663 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=1 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=24487) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73611 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.585 ms Execution time: 11420.805 ms (69 rows) COMMIT; COMMIT