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 ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1671099.74..1671101.57 rows=729 width=38) (actual time=9908.287..9908.287 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=2034578 read=252315 dirtied=1422 written=108 -> HashAggregate (cost=1671052.32..1671065.08 rows=729 width=38) (actual time=9908.226..9908.227 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2034575 read=252315 dirtied=1422 written=108 -> Hash Join (cost=39429.01..1670585.50 rows=23341 width=38) (actual time=722.042..9869.254 rows=24275 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2034575 read=252315 dirtied=1422 written=108 -> Nested Loop (cost=39427.45..1670146.30 rows=23341 width=16) (actual time=721.971..9836.123 rows=24275 loops=1) Buffers: shared hit=2034571 read=252315 dirtied=1422 written=108 -> Hash Join (cost=39427.16..1662615.03 rows=23341 width=16) (actual time=721.950..9657.974 rows=24275 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1961624 read=252315 dirtied=1422 written=108 -> Nested Loop (cost=396.47..1622913.29 rows=116705 width=20) (actual time=7.122..8870.837 rows=121250 loops=1) Buffers: shared hit=1816300 read=251484 dirtied=1422 written=108 -> Nested Loop (cost=396.04..1434101.26 rows=385608 width=16) (actual time=7.066..3827.510 rows=399454 loops=1) Buffers: shared hit=254816 read=213031 dirtied=1367 written=98 -> Bitmap Heap Scan on part (cost=395.47..27427.83 rows=12780 width=4) (actual time=6.992..155.889 rows=13289 loops=1) Recheck Cond: ((p_type)::text = 'SMALL ANODIZED NICKEL'::text) Heap Blocks: exact=11397 Buffers: shared hit=1456 read=10024 written=11 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..392.28 rows=12780 width=0) (actual time=4.789..4.789 rows=13289 loops=1) Index Cond: ((p_type)::text = 'SMALL ANODIZED NICKEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.76 rows=31 width=20) (actual time=0.025..0.266 rows=30 loops=13289) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=253360 read=203007 dirtied=1367 written=87 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=399454) 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=1561484 read=38453 dirtied=55 written=10 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=711.152..711.152 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=145324 read=831 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.713..627.388 rows=299838 loops=1) Buffers: shared hit=145324 read=831 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.038..0.067 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..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.014..0.014 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=0.008..0.008 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=905.11..6455.64 rows=60000 width=8) (actual time=17.636..115.591 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=145322 read=831 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.512..11.512 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=24275) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72947 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.912 ms Execution time: 9909.099 ms (68 rows) COMMIT; COMMIT