BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 = 'STANDARD POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1671720.00..1671721.82 rows=729 width=38) (actual time=10391.488..10391.489 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=1767216 read=213203 dirtied=384 written=76 -> HashAggregate (cost=1671672.58..1671685.34 rows=729 width=38) (actual time=10391.417..10391.419 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1767213 read=213203 dirtied=384 written=76 -> Hash Join (cost=39429.11..1671206.02 rows=23328 width=38) (actual time=911.556..10353.944 rows=24066 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1767213 read=213203 dirtied=384 written=76 -> Nested Loop (cost=39427.55..1670767.06 rows=23328 width=16) (actual time=911.484..10319.151 rows=24066 loops=1) Buffers: shared hit=1767209 read=213203 dirtied=384 written=76 -> Hash Join (cost=39427.26..1663239.98 rows=23328 width=16) (actual time=911.461..10102.919 rows=24066 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1694867 read=213203 dirtied=384 written=76 -> Nested Loop (cost=396.57..1623538.62 rows=116638 width=20) (actual time=7.940..9114.227 rows=119342 loops=1) Buffers: shared hit=1552637 read=209278 dirtied=384 written=63 -> Nested Loop (cost=396.14..1434913.20 rows=385231 width=16) (actual time=7.738..4281.577 rows=393618 loops=1) Buffers: shared hit=283544 read=176842 dirtied=283 written=55 -> Bitmap Heap Scan on part (cost=395.57..27442.95 rows=12793 width=4) (actual time=7.661..172.064 rows=13115 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD POLISHED TIN'::text) Heap Blocks: exact=11148 Buffers: shared hit=1913 read=9317 written=1 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..392.38 rows=12793 width=0) (actual time=5.304..5.304 rows=13115 loops=1) Index Cond: ((p_type)::text = 'STANDARD POLISHED TIN'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.71 rows=31 width=20) (actual time=0.030..0.303 rows=30 loops=13115) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=281631 read=167525 dirtied=283 written=54 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=393618) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1269093 read=32436 dirtied=101 written=8 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=899.148..899.148 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=142230 read=3925 written=13 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.045..799.892 rows=299838 loops=1) Buffers: shared hit=142230 read=3925 written=13 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.057..0.088 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=0.009..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.021..0.021 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=0.015..0.015 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=19.211..149.513 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=142228 read=3925 written=13 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.598..12.598 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=830 written=6 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24066) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72342 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.026..0.026 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=0.005..0.011 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.149 ms Execution time: 10392.367 ms (66 rows) COMMIT; COMMIT